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.
A Robin's Favorite Winter Foods In winter robins concentrate on berry bushes, trees and vines, like the bittersweet vine above. (On warm days, though, you might spot a robin running on lawns, searching for worms!) Winter robins eat berries, other fruits, and seeds they find on shrubs, trees, and vines.