Heterodontiformes is an order of sharks, members of which are known as bullhead or Port Jackson sharks.
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- Bullhead Shark Photograph of two Port Jackson sharks (Heterodontus portusjacksoni) and information from Wikipedia on the anatomical features that distinguish members of the order Heterodontiformes.
- Crested Bullhead Shark Description and photograph from Wikipedia of this species from the western Pacific.
- Horn Shark Biological profile of Heterodontus francisci with photographs and information on its taxonomy, distribution, distinctive features, reproduction, interaction with humans and status