| Halisaurus was a mosasaur. But it
was much smaller than its giant relatives like Hainosaurus. It
loitered in submarine caves and cracks. It may have waited around
ledges above the water where hesperornis gathered. When the
hesperornis leave their rocky ledges to dive for fish, the
halisaurus are down below, waiting for an opportunity to ambush
them.
Mosasaur teeth are good at piercing the skin of their prey but
bad at slicing flesh. So once halisaurus has caught its prey, it
swallows it. Its jaw has flexible joints within it and can open
incredibly wide.
Like other mosasaurs, Halisaurus has extra teeth called pterygoid
teeth, that it uses to hold on to its prey while its jaw moves
forward to swallow the hapless victim whole.
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