They tend to stay in one place and wait for prey; they are lie-in-wait predators.
en.wikipedia.org Populations of both fish were studied in the wild, where the fish typically dine on two major types of prey.
news.utexas.edu The precursor to, for example, a wing, might originally have only been used for gliding, trapping flying prey, or mating display.
en.wikipedia.org Binoculars with large objective diameter are used to spot prey at great distances, sometimes in waning light.
en.wikipedia.org Generally, most mosasaurs had sharp teeth evolved to grab soft, slippery prey like fish and squid, which, in later species, were later modified to rend flesh, as well.
en.wikipedia.org