Be very careful if you're caught in a large room with an occamy! The serpentine-bodied creature will grow to fit available space, meaning it can stretch its body to every corner of a room or it can shrink itself to fit into a tiny tea cup. Its eggs are also incredibly valuable, as they're made of pure silver. That's why Newt Scamander gives them to Kowalski to help finance his bakery. Fun fact: you could have an occamy as your Patronus.
Dimensions : 10,8 cm x 18,4 cm