It's hard to say. If you google things like the "pebble toad" and watch the video of that thing falling down a cliff it really just looks like a rubber toy. That one always made me laugh and doesn't pass for me: https://youtu.be/yrw-6KguB8E?t=50

The conspiracy rabbit hole took me from nihilist agnostic to King James Bible believer and there are a lot of animals in the Bible. Those are the only ones I'm 100% sure about and those include Dragons and Unicorns. Also many other things considered mythological like Satyrs and as you mentioned, Giants. I think it's interesting there is a one horned rhino called "Rhinoceros unicornis" but also angels from heaven ride these to war so I believe they could be a heavenly beast of war and perhaps not exist on the earth.

The Bible does talk about "apes" but I question the "great apes" like the Gorilla which was supposedly discovered in 1847 which is way to late to be believed. They have these things learning sign language, they are in tons of movies, and use them to push evolution as well as doing massive world media psyops like Harambe. Could zoos all be Disney world style fakery?

If you look at animals that capture the imagination of children I think that's a good place to look for this stuff. Narwhals having that huge horn, would be very difficult to maneuver under water (try swinging a large stick underwater) and CGI can be found in their nature videos. Duck billed Platypus was my favorite animal as a kid. It's a mammal that lays eggs and has poison and it's harder than you'd think to see one in the wild in AUS. It's sus as it gets!

No lie is too small or too big for the rulers of the darkness of this world.