Which of the following is an example of mutualism? A. Twisting about like a high-flying acrobat, the gray flycatcher plucks moths from the air.
B. On the bird feeders of many residents of southern Illinois, people can watch the fox squirrels and gray squirrels fight with each other for the bird seed, while the birds get scared away by the activity!
C. Scratching with great vigor, the chipmunk tried to knock loose the tick stuck firmly to its ear.
D. Some biologists have observed Egyptian Plovers, a type of bird, land on the open mouth of a Nile crocodile without being eaten and remove leeches stuck firmly to the crocodile's gums.