Birds and crocodiles are the closes living relatives of dinosaurs, with birds being closer.
lets first take a look at the relation between dinosaurs and birds. If you look at the skeletal structure of a dinosaur and a bird side by side, you'll notice a few similarities. First, look at the hipbone of a dinosaur; it is turned backward, just like a bird. Second, by watching some Birds of Prey, you can see how a dinosaur may have looked. They bob their heads, they strike with their talons, etc. Additionally, many dinosaurs are now known to have had feathers.
Birds
The largest animal alive today that is related to dinosaurs would be the saltwater crocodile.
The animal most closely related to humans is the chimpanzee.
The dugong is closely related to the manatee.
A pterodactyl is technically not a dinosaur people just think it is. But, it certainly is a very very close relation to the dinosaurs, belong to a group of reptiles called pterosaurs. Even more closely related to dinosaurs are modern birds.
Humans are most closely related to chimpanzees.
Chimpanzees are the animals most closely related to humans.
Birds evolved from non-avian theropod dinosaurs. Because all non-avian dinosaurs are extinct, the closest living relatives of birds are crocodillians. Crocodillians and birds are the last surviving archosaurs. Two extinct archosaurs are dinosaurs and pterosaurs.
rhiniceros
No animal most closely related is chimp
No. There was no animal that vaguely resembled a human at all. Mammals that lived at the time of the dinosaurs were small, shrew-like animals :) But monkeys are awesome.
Archaeopteryx is not believed to be an ancestor to any modern animals. However, it was probably closely related to the evolutionary link between birds and dinosaurs.