Powered flight has evolved separately in three tetrapod clades: pterosaurs, birds (avian dinosaurs), and bats. To meet the challenges of powered flight, tetrapods acquired structural, mechanical, and ...

Crayfish are sometimes called crawfish or crawdads. ©iStock.com/BZH22 Crayfish (or crawfish) can be found all over the world, from North and South America to Europe ...

The Atlantic Forest has one of the richest avifaunas in the world, with endemic, migratory and endangered taxa. However, some of the ornithological knowledge produced there has yet to be organized and ...