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S.Peelman said:
OTBWY said:

Second one: Terror bird. This thing hunted horses. It went extinct around 2 million years ago. It couldn't compete with the sabred cats that migrated to its continent when north and south America joined.

That, is one gigantic bird. I like how the other horses are also like WTF. Imagine coming across one of those during your casual lunch-break walk in the park or something.

It's funny that in the past there were all these huge animals, monstrous times.

There are multiple theories on why they died out. Most say it was them being replaced by sabretoothed cats, but there are also other theories that say they were already dying out before the cats came. Wolves coming to America from Alaska land bridge could also have caused their numbers to dwindle. Some of their prey could have also died out or become to fast for them to prey upon. Multiple factors are always at play.