The bison were gathering into large migratory herds and heading south.

The aquatic theory is discarded and we begin to see suggestions of migratory herds.

Each year the migratory herds of reindeer dropped their antlers to make way for the next year's rack, and each year they were gathered up.

They were starting to come together to form the huge migratory herd that would develop later in the season.

They were moving along an upward path the migratory herd had not taken.

They raided the migratory herds of yelk and gunnadu.

These diverse strategies for survival amongst the migratory herds could also provide an evolutionary route towards nomadic pastoralism.

Males are also present in the migratory herds and will follow the females.

It is home to some of the last remaining migratory herds, the caribou.

The e gathering into large migratory herds and heading south.