In places where the country folk eat just about anything, the invariable reply to "what's that taste like?" is "tastes just like chicken."

There's no particular reason why mouse should be any different, although it might depend a little on what (or how many) parts of the chicken one eats.

In my (current) part of the country there is universal agreement that "there are seven different flavors in a chicken," so knowing that it tastes like "something in a chicken" isn't really much help.

There also is zero agreement on what those seven flavors in a chicken are, and trying to pin anyone down on where one of 'em can be found in a chicken is likely to start a brawl.

John