Who Painted the Ostrich?

The Miss Zoo beauty pageant is about to take place. There are three competitors: the Ostrich, the Egret and the Stork. The Ostrich winds up with her head dyed green: someone replaced her feather spray with some spray paint. Who's responsible? Meanwhile, Sherlock also has some color problems of his own: the hair on his head has turned pink due to a mistake in shampoo.