Out of all of these the mapinguari is the most likely given how unexplored and vast the amazon is. It isn't reasonable to assume some mylodons may have moved and adapted into the amazon to avoid human hunters.

Probably Mapinguari

Thunderbird is the cryptid pteranodon

Mapinguari. Given how giant sloths existed very recently and due to some human interference they could still be alive.

What's the kulta?

It's probably the burrunjor, knowing australia :P

megalania cryptid not prehistoric

Thunderbird is probably an undiscovered condor

Bunnyman urban legends or creepypasta

Kaiaimunu Gazeka Lukwata And Mokèlé-mbèmbé

Universal and DreamWorks

universal and DreamWorks (1998-2021) movies and tv shows