OKLAHOMA COUNTY, Oklahoma -

Over 30 bison roaming Grand Canyon National Park's northern reaches are joining a herd in Oklahoma.

Hundreds of the massive animals have made their home at the Grand Canyon in recent years. But park officials say they're spoiling water sources and harming the landscape.

Officials came up with a plan two years ago to reduce the herd partly by corralling the animals and shipping them elsewhere. Thirty-one bison loaded in multiple livestock trailers were shipped to the Quapaw Tribe in Oklahoma on Wednesday.