Animal admired by Ogden Nash for its ability 'in such a fix to be so fertile (6)

I believe the answer is:

turtle

(Other definitions for turtle that I've seen before include "Kind of sea-tortoise, noted for soup" , "Sea swimmer" , "Neckline and reptile" , "Reptile - (kind of) dove" , "Sea-creature resembling tortoise" .)

I've seen this clue in The Guardian.

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