Two bald eagles that were fighting in midair when they locked talons. In a rare spectacle of nature, they were unable to disengage in time before crashing to the runway. This photo shows their intertwined talons. Both survived.
Photo credit: Randy Hanzal, Minnesota conservation officer
Hello!! I always struggle with this question because it’s so complicated, haha but:
The first reptiles (anapsid, synapsid and diapsid) evolved during the late Carboniferous from labyrinthodonts, which were amphibians that evolved from fish. Anapsid and synapsid reptiles basically reined supreme on land during the Carboniferous-Permian, and were then taken over by diapsids during the whole Mesozoic. They still lived alongside each other, but diapsids were far better adapted to the niches the anapsids and synapsids occupied and pushed them into the background. Dinosaurs, mosasaurs, plesiosaurs (and pliosaurs), pterosaurs, crocodilians and more are/were all diapsids. Diapsid just means they have two holes in each side of their skulls.
NOW a bunch of diapsids are classed as archosaurs- dinosaurs (and birds), pterosaurs and crocodilians (pseudosuchians). Loosely, archosaurs are described as having:
- teeth set in sockets
- two openings in their skulls on each side
- a prominent ridge on the femur to help stronger muscle attachment, which in turn allowed them to develop an upright stance (apart from alligators etc. but never mind them)
So dinosaurs have all these things setting them apart from the anapsids and synapsids, as well as 12 other distinguishing features in their skeletons that other archosaurs did not share.
This list isn’t really set in stone (hahahaha haha ha) as a definitive way of separating dinosaurs from other archosaurs, but these are the main things that all dinosaurs have/had in common. There are LOTS of other things that have been found that differed between dinosaurs or are similar to those in other archosaurs, or were present in some dinosaurs but not in others etc., so there’s a lot of work that needs to be done with checking these things and seeing what they mean and whatever. Plus, the fossil record (especially from the Triassic, when dinosaurs were just beginning to branch out) is very patchy and these gaps don’t help at all in defining these characteristics.
ANYWAY THOUGH it’s easier to just learn what is and what isn’t a dinosaur than learning why :/ I had to keep double-checking everything about a million times to make sure i hadn’t messed up but there’s some of this that is bound to be inaccurate, haha so i’m very sorry if that’s the case!!!! I tried my best sob
Pterosaurs are Terrible Lizards
thankyou very much amajordoseofinsanity!!! i’m about 1 minute in and it’s already wonderful
here a guy is debunking all the ignorant preconceived/conceived ideas about pterosaurs. basically he’s telling off the people that think they’re dinosaurs etc. and then a whole lot more
and he has a really cool voice
Experience Prehistoric Earth as a Dinosaur in an accurately recreated 3D world, Fight, Survive and reach the top of the food Chain.
PLEASE SUPPORT THIS, IT LOOKS ABSOLUTELY AMAZING ;___;
A large Asian tyrannosaurid theropod, Tarbosaurus filled the same sort of ecological niche that Tyrannosaurus rex did in North America. It was around the same height and length as its bulkier counterpart, and would have hunted the large herbivorous dinosaurs around it at the time. Being more lightweight, it probably would have hunted more often than Tyrannosaurus did, with the latter being too large to probably support itself by hunting alone, and would have scavenged for a considerable part of its diet.
Juvenile animals had a much weaker skull and teeth than the adults, meaning they would have fed on different prey and so reduced competition between them, increasing the survival rate of their young by not limiting their food.
Tarbosaurus also had a thin skull with sideways pointing eyes, unlike the wide skull and forward facing eyes of Tyrannosaurus. To compensate for weak vision Tarbosaurus had very well developed senses of hearing and smell— relying instead on these two to hunt.
my personal favourites
£10 SKETCH COMMISSIONS!!!!!
i need to get enough money to take my baby rook to the vets as soon as possible :c i’ve just been trying to research what might be wrong and i’m really worried again so i’d like to get as many of these as i can!!! i do stuff other than dinosaurs/extinct things as well
i can also do other sorts of commissions! coloured/paintings and things
worst colour scheme in the world fgfhfh this is for dan :>
(submitted by lynchianbedhead)