A few animals species and humans eat dirt, but researchers think they now know why some parrots do it.
The EPA confirmed 13 of those sites in Texas are flooded and could be damaged following Hurricane Harvey.
Plastic bags have become so pervasive in the environment that they're starting to make their way into the food chain.
Mosquitoes kill hundreds of thousands of humans every year with diseases they carry, so scientists have come up with some inventive ways to kill them.
The city expanded its Hoy No Circula policy in 2008, but air pollution levels haven't changed much since then.