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February 5, 2014
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Deinonychus Walk Cycle by EWilloughby Deinonychus Walk Cycle by EWilloughby

This incredibly cool new study by Gossi et al, published today in PLOSone, has researched whether chickens walk differently if they have a long, heavy tail, reminiscent of the type of tail present in non-avian dinosaurs. Giving them such a tail artificially (while controlling for weight) actually changes their gait significantly, giving them more hip-driven locomotion and less knee-driven as in modern birds. Check out the paper, it’s open-access.

From the abstract:

Birds still share many traits with their dinosaur ancestors, making them the best living group to reconstruct certain aspects of non-avian theropod biology. Bipedal, digitigrade locomotion and parasagittal hindlimb movement are some of those inherited traits. Living birds, however, maintain an unusually crouched hindlimb posture and locomotion powered by knee flexion, in contrast to the inferred primitive condition of non-avian theropods: more upright posture and limb movement powered by femur retraction. Such functional differences, which are associated with a gradual, anterior shift of the centre of mass in theropods along the bird line, make the use of extant birds to study non-avian theropod locomotion problematic. Here we show that, by experimentally manipulating the location of the centre of mass in living birds, it is possible to recreate limb posture and kinematics inferred for extinct bipedal dinosaurs. Chickens raised wearing artificial tails, and consequently with more posteriorly located centre of mass, showed a more vertical orientation of the femur during standing and increased femoral displacement during locomotion. Our results support the hypothesis that gradual changes in the location of the centre of mass resulted in more crouched hindlimb postures and a shift from hip-driven to knee-driven limb movements through theropod evolution. This study suggests that, through careful experimental manipulations during the growth phase of ontogeny, extant birds can potentially be used to gain important insights into previously unexplored aspects of bipedal non-avian theropod locomotion.

This study has obvious implications for how non-avian theropods walked, so I could not resist doing a quick (1 hour or so) animation of a dromaeosaur loosely based on Deinonychus doing the dino-walk.
 
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:iconmegadragomon:
MegaDragomon Featured By Owner Jan 30, 2015  New member Professional
awesome
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:iconsekley:
Sekley Featured By Owner Jul 2, 2014
"Look I'm a little chicken!"
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:iconchinmoy808:
chinmoy808 Featured By Owner Jan 13, 2015
A badass killer chicken!
Reply
:iconsagittariussigner:
sagittariussigner Featured By Owner May 22, 2014  Hobbyist
Great animation.
Reply
:icontraheripteryx:
Traheripteryx Featured By Owner Apr 1, 2014  Hobbyist General Artist
Brilliant! Like modern avian dinosaurs do, too! :D
Reply
:iconfancykarp:
FancyKarp Featured By Owner Mar 2, 2014  Hobbyist Digital Artist
Open the  door! Get on the floor!
Reply
:icongalliraptor:
Galliraptor Featured By Owner Feb 22, 2014
awesome:) (Smile) 
Reply
:iconsasiadragon:
Sasiadragon Featured By Owner Feb 13, 2014  Hobbyist General Artist
This is really cool, and I love your dino-walk! It's really cute with the wobbly head. I also really like how fluffy this thing is.
Reply
:icondewlap:
dewlap Featured By Owner Feb 10, 2014
This paper reminds me of a similar study by Carrano and Biewener (ref 7 from your link); is there a real different between the 2 experiments?

Carrano MT, Biewener AA (1999) Experimental alteration of limb posture in the chicken (Gallus gallus) and its bearing on the use of birds as analogs for dinosaur locomotion. Journal of Morphology 240: 237–249.
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:iconewilloughby:
EWilloughby Featured By Owner Feb 10, 2014  Professional General Artist
Interesting - I see that the new PLOS paper cites the Carrano study, at least. I've just downloaded it and will give it a read in a bit. Very curious to see whether it reaches any sort of different conclusion. 
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:icondewlap:
dewlap Featured By Owner Feb 10, 2014
For a moment I thought it was a follow up of the previous study then I realize it was written by different authors...

I haven't read the PLOS paper yet (only skimming through it); perhaps they actually did reach a different conclusion (like a different angle on the flexion of the knees maybe).
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:iconstegoraptor:
Stegoraptor Featured By Owner Feb 8, 2014  Hobbyist Traditional Artist
Cool
Reply
:icondontknowwhattodraw94:
Dontknowwhattodraw94 Featured By Owner Feb 8, 2014  Hobbyist Traditional Artist
This is so awesome, I hope you'll make more of these things if you have time for it :)
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:iconbabbletrish:
babbletrish Featured By Owner Feb 7, 2014  Professional Traditional Artist
Awesome!
Reply
:iconloujunior:
LouJunior Featured By Owner Feb 6, 2014
What program did you use?
Reply
:iconewilloughby:
EWilloughby Featured By Owner Feb 6, 2014  Professional General Artist
I used Photoshop CS4 to draw the frames as well as animate them. :>
Reply
:iconloujunior:
LouJunior Featured By Owner Feb 6, 2014
I need a mentor on frames.
Reply
:iconmortalwawmbaht:
MorTalWawmbaht Featured By Owner Feb 6, 2014
Oh god please make more based on other types of dinosaurs. This is amazing.
Reply
:iconewilloughby:
EWilloughby Featured By Owner Feb 6, 2014  Professional General Artist
Not sure I would have time for it any time soon, but is there any specific dinosaur that you suggest? :D
Reply
:iconmortalwawmbaht:
MorTalWawmbaht Featured By Owner Feb 7, 2014
Haha i understand. If I had to guess a couple for a series; maybe T.rex, Trike, A hadrosaur and a sauropod just to get a good range of the different body types of dinosaur.
Reply
:iconewilloughby:
EWilloughby Featured By Owner Feb 7, 2014  Professional General Artist
Well, the current study is only relevant to theropods - a similar walk cycle for sauropods or hadrosaurs would take considerably more research (and doesn't have a convenient chicken to mo-cap). Saurian has done some marvelous walk cycles with accurate 3D models for Triceratops and T. rex, though! 
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:iconmortalwawmbaht:
MorTalWawmbaht Featured By Owner Feb 7, 2014
That is true.

Haha I actually have a lot of experience watching Saurian from being pals with one of their members. Their progress makes me so proud of him.
Reply
:iconchocolatestarfire:
ChocolateStarfire Featured By Owner Feb 6, 2014  Hobbyist Traditional Artist
Heart - Free

RDJ Maybe PLZ you could make one with Iara's colors. I WILL PAY YOU MONEY.

This is pretty awesome though, I will definitely have to give the paper a thorough read and review. :happybounce: 
Reply
:iconewilloughby:
EWilloughby Featured By Owner Feb 6, 2014  Professional General Artist
If you're serious about that, I may take you up on it. :) I was considering making a cleaner colored version of this, but it would be more work than I can justify "just for fun" right now.
Reply
:iconchocolatestarfire:
ChocolateStarfire Featured By Owner Feb 7, 2014  Hobbyist Traditional Artist
Big Fool Emoji-07 (Cry) [V2] Kermityayplz

^That means yes. I will note you later on :eagerla: 
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:iconewilloughby:
EWilloughby Featured By Owner Feb 7, 2014  Professional General Artist
:boogie:
Reply
:iconzerictardusted:
Zerictardusted Featured By Owner Feb 6, 2014
It's really good. Interesting discoveries, I wonder what other results could come out of this or similar research. 
Reply
:iconpraisedovahpie:
PraiseDovahPie Featured By Owner Feb 6, 2014
Awesome animation; I could definitely imagine dromaeosaurs walking like that.
Reply
:iconrachelnoeldesigns:
RachelNoelDesigns Featured By Owner Feb 6, 2014  Student General Artist
Awesome!
Reply
:iconzopteryx:
ZoPteryx Featured By Owner Feb 6, 2014  Hobbyist General Artist
Cool study and animation.
Reply
:iconkaxanthedragon:
KaxantheDragon Featured By Owner Feb 6, 2014  Student General Artist
Very interesting indeed.
Reply
:iconalexraccoonglider:
AlexRaccoonGlider Featured By Owner Feb 6, 2014  Hobbyist General Artist
This is very accurate and nicely detailed here! you did an excellent job here =3
Reply
:icondinobirdman:
DinoBirdMan Featured By Owner Feb 6, 2014  Student Artist
That's great!:)
Reply
:iconfragillimus335:
Fragillimus335 Featured By Owner Feb 6, 2014  Hobbyist General Artist
But droms also have much bigger heads!
Reply
:iconewilloughby:
EWilloughby Featured By Owner Feb 6, 2014  Professional General Artist
True, I would be interested to see whether increased skull weight would change the gait of a chicken too! 
Reply
:iconladycorvidaea:
LadyCorvidaea Featured By Owner Feb 6, 2014  Hobbyist Digital Artist
Very nice work on this! 
sounds like a fascinating study! I will have to read it
Reply
:iconthedinorocker:
thedinorocker Featured By Owner Feb 6, 2014
Yes dr Grant it moves the head when it walks !
Reply
:iconsueanoi:
SueaNoi Featured By Owner Feb 6, 2014  Hobbyist Digital Artist
WOWWWWWWWWWWWWWWWWWWWWWWWWW
Reply
:iconf0xridley:
F0xridley Featured By Owner Feb 6, 2014
Cute and fuzzy!
Reply
:iconcld-1988:
cld-1988 Featured By Owner Feb 6, 2014
Thats great, I've never attempted a walk cycle, but i know how hard they are
Reply
:iconforgottendemigod:
ForgottenDemigod Featured By Owner Feb 6, 2014  Hobbyist Traditional Artist
Aww XD
Reply
:iconsilvervulpine:
SilverVulpine Featured By Owner Feb 6, 2014  Hobbyist Photographer
Very cool animation! :)
Reply
:iconcetaceaphile:
Cetaceaphile Featured By Owner Feb 6, 2014  Hobbyist General Artist
I want to pick it up and hold it :3
Reply
:iconcarlosdino:
Carlosdino Featured By Owner Feb 6, 2014
Cool!
Reply
:iconsmnt2000:
Smnt2000 Featured By Owner Feb 6, 2014  Hobbyist Traditional Artist

That is great, Emily! I was hoping for it!

Reply
:iconpalaeorigamipete:
palaeorigamipete Featured By Owner Feb 6, 2014  Hobbyist General Artist
oh look! a pigeon! :lol:
Reply
:iconwillemsvdmerwe:
WillemSvdMerwe Featured By Owner Feb 6, 2014
Great work Emily!
Reply
:iconraptor85:
Raptor85 Featured By Owner Feb 6, 2014  Hobbyist Digital Artist
NAAHAHAHAHAA!!! Adfuckingdorable! :heart:
This is sooo how i picture Jajka walking :D
Reply
:iconkeight:
keight Featured By Owner Feb 5, 2014
Cool. I'll have to read the study later.
Reply
:iconmommacabbit:
MommaCabbit Featured By Owner Feb 5, 2014   Traditional Artist
I knew it was gonna be based on those chickens as soon as I saw the thumbnail.xD
this is really dang pretty for a quick animation
Reply
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