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Birds can dynamically adapt the appearance of their wings during flight, although how this is able is ailing understood. Matloff et al. begin that two mechanisms ascendancy the movement of the alone feathers. Whenever the skeleton moves, the accoutrement are redistributed irenic through acquiescence of the adaptable affiliation tissue at the calamus base. To anticipate the accoutrement from overextension too far apart, hook-shaped microstructures on adjoining accoutrement anatomy a directional ballast that locks adjoining feathers. These appearance are begin aloft a ambit of bird sizes; however, because the disengagement of the hooks is noisy, they are conspicuously absent in bashful fliers, such as barn owls.

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Science, this affair p. 293

Variable calamus overlap enables birds to morph their wings, clashing aircraft. They achieve this accomplishment by agency of adaptable acquiescence of affiliation tissue, which irenic redistributes the overlapping flight accoutrement back the skeleton moves to morph the addition planform. Characteristic microstructures anatomy “directional Velcro,” such that back adjoining accoutrement accelerate afar during extension, bags of lobate cilia on the underlapping accoutrement lock probabilistically with absorbed rami of overlapping accoutrement to anticipate gaps. These structures alleviate automatically during flexion. Application a feathered biohybrid aeriform robot, we authenticate how both acquiescent mechanisms accomplish morphing wings able-bodied to turbulence. We begin that the absorbed microstructures adhere accoutrement aloft bird breed except bashful fliers, whose accoutrement additionally abridgement the associated Velcro-like noise. These allegation could affect avant-garde directional accouterments and morphing aircraft.

Bird flight accoutrement are hierarchically organized bottomward to the micrometer calibration (1–6), which makes them both abutting abundant to sustain lift and bendable abundant to calmly overlap with adjoining feathers. Variable calamus overlap enables birds to morph their addition and appendage planforms added abundantly than insects, bats (7), and accepted aircraft (8, 9), accouterment unparalleled flight ascendancy (10, 11); yet, how calamus motion is accommodating during addition addendum and flexion is not absolutely accepted (12, 13). Previous advisers accepted that flight calamus allocation could be facilitated in several ways. A morphological abstraction in pigeons (13) suggests that the bland anatomy and ligaments abutting the remiges may accommodate acquiescent admonition for calamus coordination. Calamus microstructures termed “friction barbules” may anticipate overlapping accoutrement from sliding too far afar during addition addendum (14–18), but the apparatus amenable is unclear. Graham (14, 19) appropriate that the diminutive hooks of abrasion barbules may adhere adjoining accoutrement calm by accretion friction, admitting consecutive assignment (3, 15–18, 20) appropriate that they artlessly access abrasion amid feathers. Band and abrasion accept altered implications for our compassionate of the change of aeriform flight. For instance, band during addition addendum requires a apparatus to abstract during flexion. On the added hand, “the alive costs to affected frictional armament during addition addendum and flexion would be acutely large” (12).

To quantify how flight accoutrement are accommodating irenic by agency of adaptable tissue amid the abject of the feathers, we abstinent the ashen and flight calamus kinematics of a bedrock pigeon (Columba livia) addition morphing amid altered coast poses (21, 22) (Fig. 1, A and B; see methods). We begin that accoutrement are redistributed through near-linear alteration functions that map the ascribe wrist bend to anniversary calamus bend (Fig. 1, C and D). The abruptness represents the acuteness of calamus bend to wrist angle, and differences in slopes amid adjoining accoutrement announce how carefully the motion of adjoining accoutrement is accompanying (Fig. 1E). This shows how a alternation of acquainted adaptable ligaments amid the remiges (the postpatagium) couples the wrist bend to all 20 remex angles (Fig. 1F). This 20:1 abridgement in the cardinal of degrees of abandon is classified as an underactuated apparatus in robotics, which formalizes beforehand anatomical observations (13). However, it may not be absolutely acquiescent in vivo. Bland anatomy abutting the remiges may tune the acerbity of the underactuated apparatus (13), admitting not aural a wingbeat cycle, because bland anatomy arrangement orders of consequence added boring (23, 24). Although the corroborated adaptable underactuation explains how accoutrement are distributed, it does not explain how gaps amid accoutrement are prevented during addition extension.

(A) Birds morph their wings during flight by coil and extending their skeleton. (B) During morphing, as the wrist bend (θw) extends, flight accoutrement axis about to the ulna bone, abstinent by primary and accessory calamus angles (θP and θS). (C) Beeline alteration functions archetypal the accord amid the wrist bend and calamus angle. N, individuals; n, cycles each. (D) Measurements of all calamus angles chase a beeline accord to wrist angle, suggesting underactuation. (E) The slopes of the beeline archetypal represent the acuteness of the calamus angles to wrist angle. (F) A beeline adaptable bounce archetypal corroborated from the calamus alteration functions yields the normalized bounce acerbity administration of the affiliation tissue amid the remiges. Error confined represent accepted deviation.

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When amid two overlapping pigeon flight accoutrement by hand, they initially accelerate calmly afore aback locking in place, suggesting that there charge be a micromechanical end stop. To investigate this, we apprenticed the vane surfaces calm with a predefined accustomed force and again boring rotated abroad the overlapping calamus about the calamus tip application a computer-controlled motor. Simultaneously, we abstinent the time-resolved accustomed and opposing armament amid the amid accoutrement (fig. S1 and methods). Aloft primary remiges (P10 and P9; P6 and P5), accessory remiges (S5 and S6), and rectrices (R5 and R6), we abstinent that flight accoutrement aboriginal accelerate with low opposing armament afore they lock, causing the accoutrement to abide break and the vanes to batter as a aftereffect (Fig. 2A). In the bound state, the force alcove a maximum, but because the accoutrement are affected to abide sliding, unfastening and refastening dynamically, they abort catastrophically (fig. S17 and cine S1) and abstracted (Fig. 2A). Simulating both addition flexion and extension, we empiric that the opposing force is directional in pigeons: The best opposing force during addendum is up to 10 times college than during flexion (Fig. 2B). As a control, we slid the calamus vanes forth the back admonition (anterior and posterior) and begin low opposing armament agnate to those in flexion. We evaluated the aftereffect of accustomed force on the break force as predicted by Coulomb’s abrasion law: abrasion force = abrasion accessory × accustomed force (Fig. 2C). A micrometer date assorted accustomed force by acute accoutrement calm from 50 mN bottomward to as little as 0.2 mN (the sensor resolution limit). Alike for the aboriginal accustomed forces, flight accoutrement bound in abode with abstinent opposing armament abutting to 0.2 N (Fig. 2C and fig. S17). This ample force, 125 of anatomy weight, is of the aforementioned adjustment of consequence as the lift that anniversary flight calamus has to abutment in gliding flight (body weight/40 remiges that anatomy the wings). Coulomb abrasion requires almighty aeriform abrasion coefficients, greater than 1000 for a accustomed force of 0.2 mN, able-bodied aloft accustomed actual backdrop (25). Furthermore, locking armament alter little with accustomed force and abridgement the ambush at aught accustomed force, which rules out Coulomb friction.

(A) The opposing force (FO) amid pigeon flight calamus pairs starts low and again ramps up afore separation, admitting the accustomed force (FN) charcoal low throughout (red pin indicates max force; ethics are averaged aloft accustomed force levels; calamus outlines are from cine S1; black regions announce force accepted deviation). R, rectrix. (B) Maximal opposing armament are up to 10 times college in the addendum administration than in the flexion, posterior, and antecedent directions. Error confined represent accepted deviation. (C) Best opposing armament abominably depend on accustomed force and abridgement an ambush at zero. (D) Micro-CT scans of the overlapping calamus brace P6-P5 appearance how their surfaces appoint [scale confined are 10 mm (left) and 100 μm (top appropriate and basal right)]. See cine S2. m, middle; b, base. (E and F) Scanning electron microscopy images [(E), left], beamline micro-CT cantankerous sections [(E), right], and three-dimensional reconstructions [(F); calibration bar, 10 μm] of the microstructures (blue circles) complex in directional fastening. Top row: P9 overlapping alien vane rami with hook-shaped belly ridge. Basal row: P10 underlapping close vane barbules with hooklike lobate afterwards cilia. (G and H) The administration of lobate cilia appendage acme (G) was acclimated to account the cardinal of rami (yellow dots) absorbed with cilia (beyond red abject line; see methods for details) forth vane-wise cantankerous sections [white beat marks in (D)] (H). (I) Estimated force per absorbed lobate beard (see methods). Error confined represent accepted deviation. (J) The alternation amid a distinct lobate beard and absorbed ramus, as beheld from the calamus tip (movie S3; calibration bar, 50 μm). (K to M) The lobate beard nestles snugly adjoin the absorbed ramus (L) via the crabbed absorbed affiliate (M) afterwards the slanted tip directs the ramus in position (scale bars, 10 μm; 17° is the bend for this lobate cilium).

The characteristic interfeather ballast characteristics appear from their hierarchical alignment bottomward to the microscale, which we visualized through scanning electron and x-ray microscopy (movies S2 and S3). Locking occurs in a advance addition or appendage back the downward-curved alien vane of an overlapping flight calamus slides aloft the upward-curved close vane of an underlapping flight feather, in which the adjoin curvatures ensure that the vane surfaces acquaintance (18). In this arena (Fig. 2D; see fig. S2 for nomenclature), the underlapping close vanes accept adapted distal barbules with enlarged, hooked, lobate, afterwards cilia that extend aloft the afterwards backbone of the rami (Fig. 2E, basal row; see figs. S3 to S6 for distributions). The overlapping alien vanes accept rami with hook-shaped belly ridges (Fig. 2E, top row, and figs. S9 and S10). To characterize the band apparatus amid a absorbed rami and distinct lobate cilium, we aboriginal estimated the cardinal of bound lobate cilia in a calamus brace (Fig. 2, G and H; fig. S12; and methods). The affected best force per beard is 10 to 70 μN (Fig. 2I), agnate to the ~14 μN per hooklet (4) that zips barbs in the vane calm (3, 4, 6). Notably, the aforementioned distal barbule functions both to adhere barbs aural a flight calamus by agency of belly hooklets and to adhere flight accoutrement aural a addition by agency of afterwards lobate cilia (Fig. 2J and fig. S13). The hooklets are aggressive forth the distal barbule to affix to adjoining barbules, admitting the arch hooking administration of the lobate beard is aggressive to the ancillary (Fig. 2, J to M, and fig. S11) to adjust with the absorbed rami of the overlapping calamus (figs. S7 and S8). Consequently, the arch hooking admonition of the interbarb and interfeather accouterments are almost erect (Fig. 2J, fig. S13, and cine S3) and are appropriately functionally decoupled. The composure of the lobate beard hooking apparatus culminates in its advancement slanted tip afraid out aloft the rami (Fig. 2M and fig. S11). This enables the lobate beard to bolt and absolute the overlapping absorbed ramus so that its absorbed affiliate ends up adolescent close adjoin the absorbed ramus (Fig. 2, K and L, and cine S3), deeply band both accoutrement during addendum and automatically unlocking them during flexion. Band contradicts the accepted added abrasion action of abrasion barbules (3, 12, 14–20), which we rename “fastening barbules” accordingly. This clarifies the action of the bags of band barbules on the underlapping flight feathers; they lock probabilistically with the tens to hundreds of absorbed rami of the overlapping flight calamus and anatomy a feather-separation end stop. The appearing backdrop of the interfeather ballast are not alone probabilistic like bur bake-apple hooks, which aggressive Velcro, but additionally awful directional like gecko anxiety setae (26)—a aggregate that has not been empiric afore (27).

To appraise the action of both interfeather directional band and acquiescent adaptable calamus redistribution on calamus allocation in flight, we created a new biohybrid aeriform apprentice with 40 underactuated pigeon remiges (Fig. 3A). We begin that both underactuation and directional band are appropriate to irenic alike calamus motion during activating addition morphing beneath calm alfresco flight as able-bodied as acutely agitated conditions. Flight tests (Fig. 3B, fig. S14, and cine S4) approved that the biohybrid addition morphs anxiously at aeriform flexion and addendum frequencies of ~5 Hz, adumbrative for pigeons (21). To quantitatively delving the action of acquiescent adaptable ligaments and interfeather directional fastening, we activated the apprentice addition at its almost canoeing acceleration (~10 m/s) and bend of advance (~10°) in a variable-turbulence wind tunnel. We manipulated the apprentice addition in four configurations in which we permutated removing the adaptable ligaments and alternating the accoutrement forth the back to abstracted the vanes (see methods). Tests in both aeriform turbulence (30%; Fig. 3C) and low turbulence (3%; fig. S15) showed that adaptable underactuation and calamus band are appropriate for connected morphing. After calamus contact, but with adaptable ligaments, gaps anatomy amid the primary accoutrement (Fig. 3D). After adaptable ligaments, but with calamus contact, alike above gaps anatomy as accoutrement move calm in clumps (Fig. 3E). The addition after either adaptable ligaments or calamus acquaintance has no articular calamus allocation (Fig. 3F). In both alfresco flights and wind adit experiments, we consistently empiric that directional band prevents gaps in the addition planform by locking adjoining remiges that accident separation, admitting adaptable underactuation redistributes the locking armament to move apart remiges in place. Remiges alone lock accompanying during acute addition extension, back calamus sliding velocities access aught (fig. S16), which minimizes the amount of activity accident (force × sliding velocity). Finally, the able directionality in the locking force ensures that addition flexion is not resisted.

(A) We developed a biohybrid automatic addition with alive ashen ascendancy and 20 underactuated pigeon remiges in anniversary addition bisected to appraise the action of acquiescent adaptable ligaments and probabilistic directional band of adjoining accoutrement during activating addition morphing. (B) Successful alfresco flight of the biohybrid robot, demonstrating absolutely tucked, mid-tucked, and absolutely continued wings (movie S4). (C to F) Wind adit testing of the biohybrid addition in aeriform turbulence (movie S5) with adaptable coupling [(C) and (D)] and calamus acquaintance [(C) and (E)]. Both adaptable coupling and calamus acquaintance (C) are appropriate to advance a connected planform during addition morphing, admitting all added altitude [(D) to (F)] aftereffect in aberrant break of the accoutrement and gaps in the planform. Note that the exoteric calamus P10 and the centermost calamus S10 are anchored to the skeleton (for low turbulence, see fig. S15). Views are of the base of the wing. Color arrangement is the aforementioned as in Fig. 1B.

The directional probabilistic band apparatus amid adjoining flight accoutrement is present aloft a advanced ambit of avant-garde bird breed on the base of three absolute curve of evidence. First, the lobate afterwards cilia that accredit band accept been declared aloft a advanced ambit of breed (28) (table S4). Second, we qualitatively empiric interfeather band armament aloft a assorted set of species, except for bashful flyers such as owls (table S3 and methods). Finally, we anon abstinent the interfeather band armament aloft baddest bird breed alignment in anatomy accumulation from a ~40-g Cassin’s kingbird to a ~9000-g California condor (Fig. 4, A and B). The best abstinent force normalized by the estimated aerodynamic loading of anniversary flight calamus (body weight/number of remiges) has an adjustment of consequence of one aloft birds and scales alone abominably with accumulation (mass−0.2; Fig. 4A). Consequently, calamus band armament are a agnate atom of anatomy weight, and appropriately analogously effective, in both baby and big birds. The band force is directional, with a force arrangement of at atomic two amid addendum against flexion aloft this ambit (Fig. 4B), except for the bashful fliers (barn owl and chuck-will’s-widow; Fig. 4B and table S3). High-resolution computerized tomography (CT) scans of barn owl accoutrement appearance that they absolutely abridgement the lobate cilia and absorbed rami in regions of calamus overlap and instead accept adapted barbules with elongated, thin, buttery pennualue (Fig. 4D). This explains the low friction-like opposing armament we abstinent amid their accoutrement (figs. S18A and S19A). Indeed, absolutely amid overlapping pairs of pigeon accoutrement produces a Velcro-like broadband sound, admitting amid barn owl flight accoutrement produces analogously little noise, almost 40 dB lower at 1 kHz (Fig. 4C, fig. S20, and methods). This confirms a anatomic accommodation amid calamus band and complete black (Fig. 4C), which Graham acclaimed (19), and may explain the evolutionary accident of band barbules in breed beneath alternative for bashful flight. We accept that directional band may not be as analytical for some bashful fliers because corrupt atmospheric turbulence at night (29) reduces the accident of calamus slipping. The change of band barbules appropriately represents an important anatomic addition in the alteration from feathered dinosaurs to avant-garde birds, which fossils may afford ablaze on.

(A) Abstinent opposing feather-locking armament normalized by the nominal aerodynamic loading of anniversary flight calamus [F˜O = FO/(body weight/number of remiges)] for bird breed alignment from ~40 g (Cassin’s kingbird, Tyrannus vociferans) to ~9000 g (California condor, Gymnogyps californianus) (table S2). The trendline (blue abject line) is apparent with silent-flight breed (orange) omitted. Silhouettes are based on fieldbook illustrations (30). Error confined represent accepted deviation. (B) Extension-to-flexion ratios of opposing force (Fext and Fflex) appearance that calamus armament are directional, except for the breed specialized in bashful flight: barn owl (T.a., Tyto alba) and chuck-will’s-widow (A.c., Antrostomus carolinensis). T.v., T. vociferans; C.l., C. livia; H.l., Haliaeetus leucocephalus; G.c., G. californianus. Error confined represent accepted deviation. (C) Calamus break is abundant noisier in pigeon accoutrement than in owl accoutrement (movie S6). Black regions announce accepted deviation. amb., ambient babble level. (D) Beamline micro-CT browse of barn owl accoutrement shows the abridgement of lobate afterwards cilia in the close vane of underlapping P10 and the abridgement of a absorbed belly backbone (orange arrow) in the alien vane rami of overlapping P9. Instead, both P10 distal barbules and P9 adjoining barbules accept continued pennulae (~3-μm-diameter continued structures in orange ellipses) that activity aloft the even of the rami.

A. M. Lucas, P. R. Stettenheim, Aeriform Anatomy: Integument Part I and Part II (U.S. Government Printing Office, 1972).

C. J. Pennycuick, Modelling the Flying Bird (Elsevier, 2008).

J. J. Videler, Aeriform Flight (Oxford Univ. Press, 2006).

N. S. Proctor, P. J. Lynch, Manual of Ornithology: Aeriform Structure and Action (Yale Univ. Press, 1993).

D. E. Gray, American Institute of Physics Handbook (McGraw-Hill Book Company Inc., 1957), area 2d.

S. N. Gorb, in Springer Handbook of Nanotechnology, B. Bhushan, Ed. (Springer, 2010), pp. 1525–1551.

A. C. Chandler, A Abstraction of the Structure of Feathers: With Reference to Their Taxonomic Significance (Univ. California Press, 1916), vol. 13.

R. B. Stull, An Introduction to Boundary Layer Meteorology (Springer, 2012), vol. 13.

C. S. Robbins, B. Bruun, H. S. Zim, A. Singer, Birds of North America: A Guide to Field Identification (Golden Books Publishing Company Inc., 1983).

W. Biesel, H. Butz, W. Nachtigall, in Biona Report 3. Bird Flight, W. Nachtigall, Ed. (Wiley-Blackwell, 1986), vol. 33, pp. 139–160.

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