An animal - or...? from Unknown

Gd'day Word Spy,I just wanted to ask for a little help in solving the rebus in your second book.Apart from knowing that it's an animal, I'm clueless. 

from Unknown


Dear Unknown,

(Good to know someone else whose name begins with U!)

Thanks for your message - I'm on the road but more soon!

yours, the (Unknowing) Word Spy