Idiom question

[A. Vine]

Laurence Horn wrote:

> rooster/hen).  But the case of horses appears to be a counterexample:
> filly is [+fem], colt usually [+male].  I wouldn't be surprised to find
> that some people take colts to include fillies, though of course never vice
> versa.  (I'm from New York City, so I don't have any valid intuitions
> here--they're all just horses to me, big'uns and little'uns.)
>

Well, there is "foal".