Assertion: spiny dogfish's fin | /r/AtLocation | the top of the shark
Facets:
Source sentences:
text: Anterior Dorsal Fin - The fin that is located on the top of the shark, towards the middle, which contains a spike to help drive off predators.
text: Posterior Dorsal Fin - The fin that is located on the top of the shark, just before the caudal fin, which contains a spike to help drive off predators.