Bob Burnett from Barefoot mining.

The three categories are:

Elephants: large, easy to target.

Wild horses: midsize, often in herds but might just be a few. Harder to target because they run fast and change direction quickly.

Rabbits: small, usu individual miners, hard to see them and, thus, the hardest to target. Lots of them, multiply quickly, and disappear into the grasses/underground dens in a flash.