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Hi TFF, I am a Dromaeosauridae enthusiast and have been collecting online for a little while now. I want to thank the members here for getting me educated on so many aspects of fossil teeth identification. I want to share my small collection in the hopes this is helpful for some of you in the future. Your critical input is highly appreciated, as always! #1 First up, one of my treasures, a robust Deinonychus antirrhopus tooth from the Cloverly Fm. A big thanks to @StevenJD for letting go of this one – much appreciated! Note the asymmetry in the placement of the carinae, best noticeable from the top view. #2 Representing the Judith River Fm., a cornerstone of my collection, a 1st left premaxillary tooth of Dromaeosaurus albertensis. I just love the way the mesial carina ‘folds’ onto the lingual surface. #3 Another premaxillary tooth from the Judith River Fm., a Zapsalis abradens with prominent ridges. The mesial carina has a nice twist, the cross section looks rather symmetrical, so likely not a 1st or 2nd premax. Distal denticles are hooked towards the tooth tip, but no mesial denticles are present and the tooth is not recurved. So, for now it is labeled as cf. Zapsalis abradens after Currie and Evans 2019, but could eventually be re-labeled as Saurornitholestes langstoni.

I tought I could share one fun project I had. 1:1 scale Deinonychus head. It might not be totally accurate and it is already over 10 years old.

Hi all, Any thoughts on the legitimacy of this deinonychus rib fragment? There's no further locality information than the Cloverly formation, Montana. Is it possible to identify fragments like this down to species? The structure of two ridges running down the outside of the rib seems common to dinosaur ribs in general. There is a bit of "honeycomb" structure where it's worn - is that suggestive of it being theropod? Even then, could you distinguish it from ornithomimid or juvenile acrocanthosaurus remains? I've asked the seller for extra details on ID - I'll update the thread if they reply.

Fast. Intelligent. Deadly. The "Raptor" is perhaps one of the most famous dinosaur today thanks to Jurassic Park. To many people's surprise however, raptors are heavily feathered and nimbler than movies would have you believe. The Jurassic Park Velociraptor was merely the size of coyote in real life! In fact, their proper family name is 'Dromaeosaurid'. The largest species was Utahraptor, and it grew to the size of a grizzly bear! Dromaeosaurid fossils have been found all over the world. They first appeared during the Cretaceous, though isolated teeth have been found in the mid-Jurassic. Allow me to present my humble collection of Dromaeosaurid teeth. First up, from Cloverly Formation, one of my pride and joy from @hxmendoza A dromaeosaurid from Aguja Formation. I am seeing more Aguja fossils showing up, but dromaeosaurid teeth are still rare. Now, for the dromaeosaurids from the famous Hell Creek Formation. Some of them probably lived alongside T. rex. A big shout-out for @Troodon for getting me started on dromaeosaurids with this very first Acheroraptor!

Some recent dinosaur tooth and fossil acquisitions. Stegosaurus stenops Late Jurassic Morrison Formation Bone Cabin Quarry West Albany County, WY Allosaurus fragilis Late Jurassic Morrison Formation Bone Cabin Quarry West Albany County, WY Deinonychus antirrhopus Early Cretaceous Cloverly Formation Southern Big Horn Basin. Big Horn county Montana USA Brachiosaurus altithorax Late Jurassic Morrison Formation Como Bluff Albany County, WY Tarbosaurus bataar Late Cretaceous Nemegt Formation Mongolia Triceratops sp. Late Cretaceous Hell Creek Formation Southeast Montana

Hi all, This bone section is thought to be from a limb of Deinonychus. it's from the Cloverly formation in Carbon County, Montana. Is there enough there to ID it as Deinonychus?

Hey was wondering what you guys think of this “Deinonychus” tooth? Info provided was Cloverly Formation, Montana, Cretaceous 105 myo. Those are also only the 2 photos available at the moment. Just looking at it now, one side of the tooth (nit the side with the bigger serrations) look quite worn. But i think i can make out some bumps in the first pic? So if they are serrations, the side with the more prominent serrations does look a lot larger? Thanks!

Hi!! There's a couple of questions I have that hasn´t been anwsered for too long, and every site that I visit says either contradictory information or doesn´t say anything about this topic at all. Anyway, here it goes. I've been a jurassic park fan for as long as I can remember, and I´ve always wondered if the velociraptor intelligence in the movie was, at least, close to reality. Even if another dromaeosaur like deinonychus had it.Also, In the movie, velociraptor sizes are awfully wrong compered to their real life counterparts. However,I've heard many times that the size of the velociraptor in the movie is the same that the size if Deinonychus. My question is: Is this real? Thanks to anyone who answers this post!

As far as I can tell, the evidence for pack hunting among Deinonychus hasn't changed; nor has any evidence come to light that contradicts it. The only argument I can find is that modern archosaurs don't pack hunt. But Harris hawks do, I don't know where that argument even comes from.

Hands are very important to everyone including Dinosaurs .. here are some photos of your not so ordinary ones ........both herbivore and theropod. Some pretty cool configurations.. Paper on the evolution of Theropod dinosaur Hands https://onlinelibrary.wiley.com/doi/full/10.1111/joa.12719 The evolution of the manus of early theropod dinosaurs is characterized by high inter‐ and intraspecific variation Daniel E. Barta, Sterling J. Nesbitt, Mark A. Norell First published: 08 November 2017 https://doi.org/10.1111/joa.12719 Have to thank Joao Vasco Leite for a bunch of these photos and info.from Twitter From the Triassic dawn of Dinosaurs here is the left hand of Herrerasaurus from Argentina Also from the late Triassic a sauropodomorph Plateosaurus, a beautiful specimen From the Early Jurassic of Argentina the ariticulated hands of the sauropodomorph Adeopapposaurus , wow The Jurassic brought us Dilophosaurus and sorry Jurassic Park fans there is no conclusive scientific evidence that it could spit poison Staying in the Jurassic here is Allosaurus and the different growth stages of its hand claws Also from the Morisson the tiny hand of the herbivore Camptosaurus The Jurassic also brought us the exquisite left forelimb of the stegosaur Gigantspinosaurus, from the Zigong Dinosaur Museum Stegosaurus hand material is quite rare, especially fairly complete ones. Morisson Formation One of the classics, first described by O.C. Marsh back in 1884. The left hand of Ceratosaurus. The bone to the right is metacarpal I, the first bone of the "thumb" . Have to wonder what it was used for. The Late Jurassic theropod Tanycolagreus ..cast From the early Cretaceous the hand of the recently described alvarezsaurid, Bannykus from China Also from the Early Cretaceous of Utah the left hand of Cedrorestes an iguanodontian Everyones favorite the hands of Deinonychus