Will Aliens impersonate all human races on Earth to make us believe they're human? [Spirituality & Religion]

😉aliens have been here for centuries....check their frequent flyer miles.lol

Aliens are allergic to ammonia and banjo music. They also have big pink spaceships.

Yes

It will be hard to tell if the aliens decide to masquerade as Germans!
Will the aliens excrete more ammonia than Germans do?