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

Regular Tet Zoo readers will recall the article from March on ratite and tinamou evolution. Ratites, just in case you don't know, are the flightless kiwi, ostriches, rheas, emus and so on, while ...

Add Yahoo as a preferred source to see more of our stories on Google. Today, trees and other plants are at the mercy of animals, and so have need of an advocate like the Lorax. In the Devonian, ...