Nature is clearly in crisis—but what do researchers do when they only have imperfect data on the extent of the losses?

Three species of honeycreeper now sing much more similar songs, as their populations decline.

Was that wrong?

They found love in a noisy place.

Our fishy ancestors might have gotten a cognitive boost just by leaving the water.

A rare animal found a rare plant. Then, it seems, the two teamed up.

Interspecies mating has long been thought of as a mistake. But in the desert, it may sometimes be the best way to breed.

Step 1: Dig tunnel. Step 2: Cultivate roots. Step 3: Profit.