Image copyright Parks Canada via Reuters Image caption Bison returned to Banff last week after an absence of more than 100 years

A herd of plains bison have been successfully reintroduced to Canada's oldest national park, more than 100 years after they were nearly hunted out of existence.

The 16 bison were moved to the Banff National Park in Alberta last week.

On Monday officials said the transfer had gone smoothly and the animals were adapting well to their new home.

The move will restore their role in the park's ecosystem, officials say, and has been welcomed by indigenous groups.

The bison will be kept under observation in an enclosed pasture of the park in the foothills of the Rockies until the summer of 2018, Parks Canada officials say.

Image copyright Parks Canada via Reuters Image caption The animals were prized by aboriginal Canadians for the food and clothing they supply

Image copyright Parks Canada via Reuters Image caption If the phased release goes according to plan, the bison will be allowed further into the park next year

Image copyright Parks Canada via Reuters Image caption The bison have been arriving at Banff since the end of January

The animals were once the dominant grazers in the park, in addition to being spiritually significant to Canada's aboriginal groups, supplying them with food, clothing and shelter.

The herd will eventually be released into a far wider area of the park where they will be at liberty to interact with other native animals and search for food, The Calgary Herald reported.

It said the hope is that natural barriers and wildlife fencing will stop the bison from wandering astray.

BBC Nature - Bison facts

"By returning plains bison to Banff National Park, Parks Canada is taking an important step toward restoring the full diversity of species and natural processes to the park's ecosystems while providing new opportunities for Canadians and visitors to connect with the story of this iconic species," Canadian Environment Minister Catherine McKenna said.

At one time, there were as many as 30 million bison on the plains but they were hunted almost to extinction with only a handful remaining in government-controlled areas.