This evening on my drive home from work in Yellowstone, I spotted a late bison calf trotting down the road near the Gardner River at the north entrance. Bison usually give birth to calves in late April through May, and the offspring bear the distinctive reddish-orange coat, which typically begins to darken after ten weeks. As this little guy was still sporting the bright color, he must have been born late in the summer. I hope he makes it through the winter--I'll keep you posted on future sightings.
Late bison calf with mother in Yellowstone