Mammals
"Hey," Keely said to her brother, Reg. "This is a good day for a bug walk!"
"What is it with you and bugs?" he asked. "Rocks are so much better."
Keely got a serious look on her face and started to sing,
"Rocks are boring, rocks are dead.
Reg has rocks in his head."
"Rocks don't do anything," she said with a sniff.
"That’s why I like them," Reg said. "They don't fly away, they don't bite and they last a long time."