It's a camel.
Something you could have found out if, like my Mum, you double-clicked on the picture to get a better look and saw it described as 'camel.jpg'. Genius alert.
The reason I posted it, is honestly not because it looks like a giant hairy appendage, it's because as she sat back on her heels to survey the finished masterpiece, she frowned, rooted around for a grey felt tip pen and with painstaking precision added a dot in the middle of the picture:
Then she turned to me and with complete seriousness said:
"I added an eye so that you should know it's a camel"
Oh. Of course.
I loved all of your comments. Thankyou, and huge props to Laura for guessing right first time that it was a camel. You must have noticed its eye.