Dinosaurs and alligators may both be reptiles, but the similarities were thought to be few and far between. So birds aren't just closely related to dinosaurs, they really are dinosaurs! Photographs by Robert Clark. This is what most people mean when they say that birds are reptiles, although technically, according to the phylogenetic system, birds, reptiles, and mammals all share a reptile-like ancestor. But what about from a different perspective? That structure is quite distinct from that of dinosaurs, alligators, ancient birds and … Alligators are related to dinosaurs, or rather, are the only surviving dinosaurs that did not "evolve." After birds the closest living relatives of dinosaurs are alligators and crocodiles. Dinosaurs are not lizards. Since alligators are reptiles they are closer to a reptile,however they are also closly related to birds since reptiles are considered closly related to birds. Dinosaurs are commonly thought to have been warm-blooded, while alligators … How long have these animals been going their own separate ways? Yes they are pretty close , dinosaurs are closer to crocodilians (like alligators) , turtles and birds than they are to lizards or snakes. These Are the Dinosaurs That Didn't Die. Although both crocodiles and alligators are more closely related to birds than they are to any other reptile, crocodiles and birds are archosaurs, a family that includes the dinosaurs. Since alligators are reptiles they are closer to a reptile,however they are also closly related to birds since reptiles are considered closly related to birds. 13 Minute Read. By Victoria Jaggard. More than 10,000 species still roam the Earth. In modern birds, two bones known as the premaxillary bones fuse to become the beak. In a sense, yes. We call them birds. Crocodiles and alligators survived the impact because they lived in water and weren't flash fried like the dinosaurs in North America. Alligators are even more closly related than most reptiles becuase the date back to the same era as many dinosaurs which some scientist believe dinos are closer to birds than reptiles. Dinosaurs are not closely related to lizards and neither are crocodilians. Alligators and birds are part of the same larger group, called archosaurs, which has existed for 250 million years and which has given rise not only to birds and crocodilians, but also to dinosaurs. The word "dinosaur" is Greek for "terrible lizard." Crocodiles, alligators, and dinosaurs (including birds) are all archosaurs, and the last living representatives of that group, so of course they're more related to each other than to other animals that aren't archosaurs. They were able to survive the aftermath because they can eat fish and other things that live underwater. Alligators and birds are part of the same larger group, called archosaurs, which has existed for 250 million years and which has given rise not only to birds and crocodilians, but also to dinosaurs. Though dinosaurs are now extinct, the crocodilians, such as alligators, crocodiles, and narrow-jawed gharials live on, and scientists see in them many characteristics of the primitive archosaurs. And they are most closely related to crocodiles, which also came from archosaurs. Scientists now know that dinosaurs are more closely related to birds than to reptiles, but early scientists, who began seriously studying paleontology in the mid-1800s, thought they were close to reptiles.

Crocodiles are more closely related to humming birds than they are to any lizard, snake, or turtle. Birds are actually direct descendants of dinosaurs and are considered by many to be dinosaurs. Lizards do not share an immediate common ancestor with crocodiles or dinosaurs (the common ancestor is much more distant).