Plural of Platypus
The Quick AnswerThe plural of platypus is platypuses.
The Plural of PlatypusThe plural of platypus is platypuses.
- Both male and female platypuses are born with ankle spurs, but only the male's spurs produce venom.
- In captivity, platypuses have survived up to 17 years of age.
The noun platypus adheres to the standard rules for forming the plurals of nouns in English (shown in the table below).
Are You Good at Plurals?Here's a quick test.
The Standard Rules for Forming the PluralsThe table below shows the standard rules for forming the plurals of nouns in English.
|Type||Example of Type||Forming the Plural||Plural|
|Most Nouns|| lamp
|add s|| lamps
|Noun Ending s, sh, ch, x or z|| platypus
|add es|| platypuses
|Nouns ending [consonant] o|| hero
|add either s or es
(There are no rules for this - you have to know.)
|Nouns ending [vowel] o|| patio
|add s|| patios
|Nouns ending [consonant] y|| story
|change the y to an i and add es|| stories
|Nouns ending [vowel] y|| donkey
|add s|| donkeys
|Nouns ending f or fe|| dwarf
|ves and/or s
(There are no rules - you have to know.)
hooves or hoofs
|some nouns undergo a vowel or letters change|| men
|More exceptions|| salmon
|some nouns do not change at all|| salmon
|Foreign rulings|| cactus
|some nouns adopt foreign rulings|| cacti
Why Is There Confusion over the Plural of Platypus?Confusion arises over the plural of platypus because many believe it is a Latin noun that should be pluralized with an i (just like cactus becomes cacti).
Through common usage (even though incorrect), platypi is becoming an accepted plural for platypus. Nevertheless, the safest version to use is platypuses. (See the difference in Google's Ngram Viewer.)