We’d do it at night. We’d tape a high-intensity flashlight to the barrel of a CO2 air rifle. We’d shine the light over the haybales and look for eyeshine.
Cats have green shine OK
Dog silver shine OK
Snake-Yellow OK
Rat, rabbit, gopher little beady red eyeshine - fire until the shine goes away
lol...we hunt rabbits at night.Look for the red.