Animation Description
The graphic that accompanies this multiple choice item show skulls belonging to the frog, human, hare, fossil crocodile relative, and bird. Each has purple highlighting that identifies the eye sockets and nostril hole. The fossil crocodile relative and bird skulls have an additional hole between the eye and nostril that is highlighted in green. When option "c) bird and fossil crocodile relative" is clicked, these two skulls are highlighted. When any other option is clicked, the reader is instructed to "try again."
Animation Text
Panel 1
Which of the tetrapods have this opening?
a) hare and fossil crocodile relative
b) frog and hare
c ) bird and fossil crocodile relative
Panel 2
Feedback from a) hare and fossil crocodile relative
Oops. Does the hare have skull openings other than those of eyes and nostrils? Try again.
Panel 3
Feedback from b) frog and hare
Oops. How many skull openings do frog and hare have? Try again.
Panel 4
Feedback from c) bird and fossil crocodile relative
Good job! Birds and crocodiles both have an opening in the skull in front of the eye. Let's map this new feature onto the cladogram.