SASKATOON -- Wanuskewin Heritage Park welcomed an unexpected addition to the family over the weekend.
A "bonus baby bison" was born early Sunday morning, according to the park.
"Although it's rare, bison can give birth this late in the season," the park said in a social media post.
"This little heifer has some catching up to do with her big sisters as they have grown quite a bit since they arrived in May," the post said.
The baby's arrival is so late that it is already rutting season, a time when adult bison are searching for love.
The park says the newborn bison is "very strong" and has a "very attentive" mom.
"So we're certain she will be just fine."