Mailboxian

The Mailboxians are a species from Rick and Morty.

Biology
Mailboxian are a species that resemble mailboxes walking on two feet. The have two sexes with females being referred as "Femailboxians". Some resemble letter boxes while others appear to be post boxes.

Culture
The Mailboxians appear to possess a society equivalent to 21st century Earth. Though their houses resemble their biology.

Source

 * Rick and Morty: Season 5: Episode 5 - Amortycan Grickfitti