No, they are crocodiles and sharks! Why would they be dinosaurs?
K, forget the sharks, let's keep with the crocodiles, they have been existing since the time of the dinosaurs as we all understand it, only that they were bigger, or had larger mouths, and during all this time, they have just shrinked, but their anatomy is the same that back then. And they are reptiles, cold blood, carnivores... So I think that they are dinosaurs that have survived until our days.
Or do they just don't fit into the definition of "dinosaur"? I think they do. If not I'd like to read why.
I would look for it myself, but it's 3:50 in the night, I just came from a party and I'm going to sleep, so I'll be glad to read about it tomorrow. Good night!