- "Our morphs were like the squirrels scampering around your backyard right now. Gray, brown, and white fur. Long, twitchy bushy tail. Big, twitchy dark brown eyes. More energy than a hyperactive kid after a dozen cups of coffee. Between the five of us we were jerking our heads, looking in every possible direction, about nine times a second."
AcquiringEditCassie acquired Magilla, a squirrel who was a patient at the Wildlife Rehabilitation Clinic, in The Message. Jake, Rachel, Marco and Ax acquire squirrel morphs in The Proposal.
- "Cassie? Why are you out here at midnight turning into a squirrel?"
"Well, we've had some birds taken in the last couple of days. We figured it was a badger or a raccoon or a fox, but we couldn't figure out how he was getting in. So I decided to morph and wait to see when he showed up."
- ―Tobias and Cassie
- The Invasion (mentioned)
- The Visitor (mentioned)
- The Encounter (mentioned)
- The Message (acquired and morphed by Cassie)
- The Andalite's Gift (morphed by Cassie)
- The Android
- The Reaction (morphed by Cassie)
- The Underground (mentioned)
- The Departure (mentioned)
- The Hork-Bajir Chronicles (mentioned)
- The Sickness (mentioned)
- The Separation (mentioned)
- The Prophecy (mentioned)
- The Proposal (acquired by Jake, Rachel, Marco and Ax; morphed by Jake, Rachel, Cassie, Marco and Ax)
- The Weakness
- The Arrival (mentioned)
- The Unexpected (mentioned)
- The Revelation
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