[dinosaur] Non-avian dinosaurs all extinct

[Poekilopleuron <dinosaurtom2015@seznam.cz>]

Good day!

Recently I saw a discussion about the possibilities of non-avian dinosaurs still living in certain parts of the world (so called cryptids, like mysterious Mokele-mbembe). Of course this is a nonsense, but some people are very adamant in this case. So I would like to ask, what would be your most important arguments for the fact, that there can actually be NO recent sauropods and ceratopsids in Central Africa, etc.? Thank you very much, in advance! Tom