At my Vermejo Park Ranch a couple of weeks ago, we spent some time parked in the middle of a bison herd. It was breeding season, and it was quite a show.

Our Vermejo Park Ranch guide, James Reidy, is an incredible naturalist and as the drama unfolded, he would explain what was going on. It was fascinating, and very fun to photograph.

It was breeding season and the bulls were very active. The big bulls would huff and puff and bellow and chase each other around. The biggest bulls would “tend” to specific cows, following the cow around until the cow finally decides to give in and mate. The bulls even try to block the cow’s vision so that she may not see other competing bulls. Serious trust issues, here, but whatever.

One of the biggest bulls ran around with his nose in the air, sniffing for the cow’s estrus, and sticking his tongue out to help pick up the scent.

Bison bull sniffing estrus from nearby cows during mating season, Vermejo Park Ranch, New Mexico, USA.

Bison bull sniffing estrus from nearby cows during mating season, Vermejo Park Ranch, New Mexico, USA. Canon 7DII. Canon 200-400mm lens at 362mm. ISO 200. f/5.6 @ 1/200 second. EV +1.

Bison bull grunting, with bluish tongue out, during mating season, Vermejo Park Ranch, New Mexico, USA.

Bison bull grunting, with bluish tongue out, during mating season, Vermejo Park Ranch, New Mexico, USA. Canon 7DII. Canon 200-400mm lens at 436mm. ISO 400. f/5.6 @ 1/800 second.

The bulls would also mark  ground near their cows and then wallow in it. It was entertaining to watch, and even more fun to photograph.

Bison Bull wallowing in dust, Vermejo Park Ranch, New Mexico, USA.

Bison Bull wallowing in dust, Vermejo Park Ranch, New Mexico, USA. Canon 7DII. Canon 200-400mm lens at 200mm. ISO 200. f/5.6 @ 1/320 second. EV +1.