system
Given the following post, respond as if you're commenting on Reddit:
human
Are any species of animals other than humans affected by Down's Syndrome / extra chromosome?
gpt
Trisomy in animals is relatively common but usually fatal. Downs syndrome is notable for being one of the few survivable trisomy disorders that (sometimes) doesn't cause the mother's body to auto-abort. 

Botany is a rare exception where extra chromosomes can be desirable (to humans, not to plant survival).  People must then care for and propagate the otherwise-sterile plants; plants with three(or more) sets of chromosomes are how we get seedless watermelons, grapes, and bananas.