Quozl

The Quozl are an alien race secretly settling on Earth, featured into the homonym novel wrote by Alan Dean Foster in 1989.

Earth colonization
Quozl experience overpopulation in their native world and send generation-ships to colonize other planets. Once a bloody warring society, they evolved into a pacifist collective society emphasizing elaborate social behavior to avoid resurgence of violent instincts.

Once discovering the human race, they successfully established a secret colony into the Rocky Mountains and attempt to avoid contact.

Appearence and society
Their appearance, to human eyes, is similar to anthropomorphic rabbits.

They are shorter than humans (in the novel they are described also as lean and possibly digitigrade, different from the book cover). Their fur can have different colors (usually black, gray, tan) and they enjoy flash-color suits and decorative jewels.

A key focus of their behavior is a compulsory sexual drive (overpopulation is mitigated by contraceptives), while this was at first a stark difference with humans, later proved to be a turning point due inter-race relationships.

Secret/Benevolant invasion?
The Quozl appears to be of benevolant nature (albeight venting their ancient instincts through violent/gruesome arts and videos), and while individually they abhor violence, their leadership evaluate killing in protection of the secret colony.

Despite the use of planned parenthood, the Quozl population is likely to exceed the human one and overhaul their culture influenced humans more than the contrary, sparkling doubt over a possible secret invasion (biologically-driven than intentional).