My colleague and I have published a new study of cactus flowers which may help explain the conundrum. For more than a century ...

Birds are the only dinosaur lineage that survived until today. About 66 million years ago at the Cretaceous–Paleogene (K–Pg) boundary, a mass extinction event destroyed all non-avian dinosaurs, ...

Birds are the most diverse land vertebrate on the planet, and now scientists have constructed a complete evolutionary tree of the 11,000 or so known species. This data came from hundreds of studies ...

Why do you have five fingers? Why not ten, or twenty, or one? Why do so many animals have five fingers? Five seems to be the perfect number for most hands. Oddly, the first vertebrates to come onto ...

Artist's illustration of events on the sun changing the conditions in near-Earth space. (NASA via Courthouse News Service) (CN) — Whether they are found on live specimens or on fossilized trunks, tree ...

The UA has plenty of special features to offer, but one of its more overlooked aspects is its abundant plant life—specifically, that of the Laboratory of Tree-ring Research. UA’s tree-ring lab right ...