Provides the opinions of Jim Bourdon on fossil Heterodontus teeth ...

HORN SHARK Heterodontus francisci Habitat: Horn sharks typically are found during the day in caves and crevices. Average adult size: Adults can grow to be 3 feet long. Natural history: Horn sharks are named for the white spines at the front of both dorsal fins. They are docile, often found sleeping during the day in caves or crevices, or under large blades of kelp. Adult horn shark eyes are very ...