First the Aliens created Yeti as an experiment
and dropped him into the Himalayas.
Satisfied with that success, they created
the cryptid known as Bigfoot, a different
variety of Yeti, darker in color and
designed to live in a less severe climate.
They deposited him into a forest in North
America. The experiment a success, they
created hundreds more and settled them
in forests all over North America.
Because they wanted to keep Bigfoot safe from
hunters and those who would try to capture
him, they tweaked him with the ability to move
in and out of dimensions instantly, which is why
no one has killed or captured a Bigfoot to
this day, despite all the fake sightings
and conspiracy theories.
Bob Boyd