@gregger This arc is annoying as hell. It used to be REAL animals, or ones, at the very least, that went extinct.
This is just made up foolishness. He prolly had to drop massive filler arcs in cause the author got writers block.
I don't think the animals not existing is the problem. The author has been twisting and stretching animal "facts" so hard since the beginning, they might as well all be entirely fictional.
The real problem is that the story is just getting boring, simple as.
I might be the only one still enjoying this goofy manga. It was and it still is about animals front and foremost. We still getting random animal facts like what Yukari showed here, so it's all good for me.