Kangaroos are vicious

[Polycarp]

@Lemur866

Platypuses is correct.

Platypi means you think “Platypus” is a latin word like “alumnus” with a latin plural form ending in -i. However, it is a Greek composite word meaning “flat foot”, just like “Octopus” means “eight foot” or “Oedipus” means “swollen foot”. You could pluralize it the Greek way, to Platypodes, but you’d only do that if you were a total douche, because although Platypus has Greek roots, it is an English word, and therefore should be pluralized by English rules.

Good post

Pdsants who insist on “platypodes”
Should be gored to death by rhinocerotes.