Horn Shark
Heterodontus francisci

Physical Description

• A small shark, only growing to 4 feet long
• Named for the prominent spines, or “horns”, in front of its dorsal (top) fins
• Shades of tan and gray in coloration, with a blunt snout
• Prominent ridges over eyes
• Prominent black spots over entire body
• Have sharp teeth in front for grasping prey, and flat, molar-like teeth in back for crushing shellfish
• Adult males are smaller than females
• Juveniles are like miniature adults

Range

• From central California to Baja California

Habitat

• Found in kelp forests and rocky reefs
• They hide in caves and recesses during the day and hunt at night
• Prefer water less than 40 feet deep

Reproduction

• Females mature at 2 feet long, males are smaller and mature at 1.8-2 feet long
• Horn sharks lay eggs every 11-14 days from February to April
• A female may lay up to 24 eggs per season
• These sharks have some of the most unique eggs in the animal kingdom
• Their egg cases are spirals, which the females wedge into crevices; the spiral keeps the egg from drifting away
• The shark pup inside the egg case will take about 6-9 months to hatch, and hatches at 6-7 inches long

Diet

• Crustaceans, sea urchins, small fish, molluscs

Predators

• Other sharks and large fish

Interesting Facts

• Horn sharks sometimes crawl in the sand and on rocks on their strong pectoral (front) fins.
• To crack the shells of their prey, the horn shark generates the highest known bite force relative to its size of any shark.
• Horn sharks are hunted for their spines, which are turned into jewelry. They are also often caught as bycatch in fisheries. 

Sources: Monterey Bay Aquarium; Huber et al. 2005; Florida Museum

Photo: David R. Andrew

Want to see a live horn shark? Catch one on Birch Aquarium’s Kelp Cam, or visit Birch Aquarium today! You can also hold a horn shark egg at Birch’s touch tank or during their Spring Eggstravaganza!