Watch: Hawaii's mysterious 'Barbie' pink pond

The Kealia Pond National Wildlife Refuge in Maui, Hawaii, has seen a recent influx of visitors - but they're not there to see the wetlands, they've come for the bubblegum pink pond.

Scientists do not know for sure what has caused the pond to turn the bright shade of 'Barbie' pink, but they they suspect it could be down to high salt levels in the water prompting the growth of halobacteria organisms.

People are warned not to get too close or drink the water.