Wiktionary(0.00 / 0 votes)Rate this definition: upthrust(Noun) an upward thrust. upthrust(Noun) buoyancy. upthrust(Noun) an upward movement of part of the Earth's crust. upthrust(Verb) to thrust something upwards.
Predators, Food and Feeding: Natural predators of winter flounder include sharks, oyster toadfish, summer flounder, striped bass, monkfish and spiny dogfish. When feeding, a winter flounder will lie motionless, partly concealed on the bottom, with its head raised off the bottom, braced by the dorsal fin.
What eats walruses? What does a walrus eat? The walrus is a large animal that has only two predators: the polar bear and the orca, or killer whale. Orcas attack walruses that are in the water, and polar bears attack them on land or on ice floes. Polar bears usually avoid tackling adult walruses because they fear being injured by their long tusks.