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Bats face preys that employ

I have the misfortune to be currently writing a paper with word. Its not that bad, and sometimes quite funny.

I started to type "Insectivorous echolocating bats face prey that employ a variety of" and I got a jaggy underline at "prey that employ". Apparently I should either use

Insectivorous echolocating bats face prey that employs a variety of

OR

Insectivorous echolocating bats face preys that employ a variety of

My meaning is the latter, but I suspect the plural of the word 'prey' is one of these nasty illogical things in English.
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