The American bison may not technically be buffalo, but they still need a home to roam, and plenty of it. The World Wildlife Fund and the Badlands National Park in South Dakota have banded together to help expand the national icon’s range, which has shrunk dramatically since ‎Meriwether Lewis and William Clark first described the “immense herds … in every direction feeding on the hills and plains” in the early 1800s. Once 30 to 60 million strong across the continent, the bison population has dwindled to just 500,000 today. “No other species on Earth has declined so quickly,” the wildlife conservation group said.

National Parks, buffalo, bison, Badlands National Park, animal conservation, wildlife conservation, World Wildlife Funds, WWF

The WWF is seeking to raise $250,000 for the Badlands National Park by March 15. Gifts abound for those who open their wallets.

A donation of $50, for instance, gets you a pair of bison-themed tote bags, while $100 comes with your choice of two bison mugs or a “bison adoption kit” composed of a framed certificate, a bison plush animal, and species info cards.

Related: Wild bison return to Canada’s Banff National Park for the first time in 140 years

Have $250 handy? A framed limited-edition print by environmental photographer Morten Koldby could be yours.

But giving really should be its own reward. “Help give these magnificent mammals room to roam, and help ensure that the herd thrives for years to come,” it said.

National Parks, buffalo, bison, Badlands National Park, animal conservation, wildlife conservation, World Wildlife Funds, WWF

National Parks, buffalo, bison, Badlands National Park, animal conservation, wildlife conservation, World Wildlife Funds, WWF

+ Help bison at Badlands

+ World Wildlife Fund