MOUSE
The harvest mouse has pale, ginger or yellow fur, and a white belly. Its tail is almost hairless and nearly as long as its body. The harvest mouse is tiny - an adult can weigh as little as a 2p piece! It prefers habitats with long grass, but you are most likely to spot its round, woven-grass nests.
You are looking for a small canister which is big enough for trackers and tradeables