When the Dino-Killing Asteroid Hit, Mammals Were Already on the Move
Researchers suggest that ground-based mammals fared better than their arboreal relatives during the end-Cretaceous extinction ...
来自MSN3 个月
No, Dinosaurs Did Not Trudge Through Thick Rainforests
Paleobotanists recognized at least 65 different leaf shapes, mostly from angiosperm plants such as ... Just imagine multi-ton animals threading through clusters of close-growing trunks.