At least three donkeys on a Kenyan island are dying from colic each month after eating plastic from trash dumps, which scientists fear could become a global problem affecting other animals.

The Guardian reports that with little grass to eat on Lamu, the donkeys rummage through heaps of plastic and other debris, occasionally ingesting enough plastic to bring on colic. There have been numerous studies on the effects of plastic pollution on marine life, but little is known about how it is affecting land animals.