Plural Platypus

Many people believe the way to say more than one platypus is platypi. I think it's platypuses. But technically both ways are correct. The plural of octopus is octopi but the computer I'm typing on puts a red line (means spelled incorrectly) under platypi and not platypuses. but the dictionary says both ways are right. So I go by Mr. Dictionary.

Proverb of the Day: Always agree with printed objects.