Harry otters owner. If he is still alive, then you know where you level up? Go there and you will see you number of tames. Tap it and you will see his name. Tap his name and you will be able to request him!
Their a rare/ uncommon spawn. They are mainly found down south in max of a pair of two. But their usually found alone. They are a passive non-agressive tame that wont flee. (They wear hats too). Have fun!