CORVALLIS, Ore., Jan. 3 (UPI) -- A U.S. zoologist says dinosaurs may have been killed off by tiny, biting, disease-carrying insects.

CORVALLIS, Ore., Aug. 30 (UPI) -- U.S. scientists have identified a 100-million-year-old solider beetle, perfectly preserved in amber as it fought an attacker by using a chemical repellant.

CORVALLIS, Ore., June 5 (UPI) -- A Kentucky nurse and an Oregon entomologist have identified the oldest known fossil mushroom, which they discovered in a piece of amber.

ITHACA, N.Y., Dec. 11 (UPI) -- U.S. scientists say a 100-million-year-old bee fossil and a DNA study suggest bees may have originated in the Northern rather than the Southern Hemisphere.