Takes

Bigfoot is a prehistoric ape called Gigantopithecus that hides its tracks by burying its dead

There's actually a giant ape, a prehistoric ape called gigantopithecus... If they were burying their dead, it means that they have ways to cover up their tracks. So if they like kept going on this, they could definitely figure out ways to like totally avoid humans at all costs like secret tunnels and stuff under the woods.

There are alligators living in the New York City sewers

New York city sewer gators... they brought them home, they then saw that they were getting way too big or they got bored of them and were flushing down the toilet. They're all the New York City sewers eating giant rats. They're actually down there because it's super hot during the winter, it's super cool during the summer. Confirmed.