Is the crocodile the last surviving dinosaur?

Answer:

Thee crocodile is an example of a reptile. Reptiles are a more primitive class of animal than dinosaurs and existed long before the dinosaurs.

The only existing animals related to dinosaurs alive today are birds. The appearance of dinosaurs in scientific journals has altered significantly since the 1950's. At that time they were reptilian in appearance with scales etc. Now many are shown with feathers and hair to suggest their closer relation to birds.

EDIT: Birds are dinosaurs that have survived the mass extinction 65 million years ago.

Crocodiles are related to dinosaurs. They are both considered types of 'Archosaur'.