The indri, Madagascar’s critically endangered “singing lemur,” has just revealed another remarkable secret. Researchers found that the animals widen their mouths as their pitch rises, apparently helping their calls travel through dense rainforest in a technique strikingly similar to formant tuning used by human opera singers.

Healthy plants start with healthy soil. Learn the basics of garden soil, including different soil types, texture, drainage, nutrients and simple ways to prepare and improve soil for successful gardening.