Having explored the Bronx and Brooklyn, Sigrid now tells us all about Queens, which is geographically speaking the largest of the 5 boroughs of New York City.

Autumn arrives, and the bison rut draws to an end. For many animals, this is a time of quiet preparations. They are getting ready for the hardships of another winter as the cycle of the seasons continues.

The height of summer brings striking rainbow colors to one of Yellowstone’s hot springs. This is also the peak of the bison rut, when the park’s muscular bulls challenge one another for the opportunity to mate.

This is a landscape in constant flux, with a live supervolcano simmering beneath the surface. But for the young animals, there is now time to relax and enjoy the warmth and tranquility of the late summer. As they move towards maturity, a mellow sunlight shines on peaceful scenes in Yellowstone National Park.

Color and new life returns to Yellowstone as summer returns, and the animals race to make the most of this window of warm weather, which they know will be as brief as it is bright.

Sigrid talks about the different ways to get from Brooklyn to Manhattan, and about some of the characteristics of this borough. For one thing, it is more affordable than Manhattan, although by no means a cheap place to live.

Without its pack, a wolf is a far lesser threat, and the other animals know it. However, for the lost bison calf, trapped on a small island, a lone wolf is a mortal danger, one that would take a minor miracle to survive.

In the first of two parts, we look at Brooklyn's beginnings and how it came to be one of New York City's boroughs.

A young bison calf is swept away by the icy torrent as the herd crosses a river. Against the odds, it washes up on a small island, but with night approaching, and its mother nowhere in sight, the outlook seems bleak for this little one.

The borough of the Bronx has gotten a bad name because of issues with poverty and crime. It's also had its share of neglect and mishandling on the part of local and state administrations. However, the Bronx also has some claims to fame, such as the Bronx zoo and botanical garden.

As soon as it can stand, a young bison calf follows its mother and the herd, even through rivers of ice cold melt water. Meanwhile, the carcass of a bison that did not survive is fought over by wolves and grizzly bears.

Yellowstone is home to a small cougar population, but theyare rare and seldom seen. The noisy ruffed grouse or “thunder chicken” is far less elusive, as the males “drum” their wings loudly in the breeding season, advertising their presence to any nearby female birds.

The Bronx was the first area to become part of New York City. Lying to the north and northeast of Manhattan, it was a logical addition. The quirky name of this borough has its own history.

Warm sunshine melts the last of the winter snow, and in the valleys of Yellowstone, animal mothers give birth to their young, bringing them into a beautiful yet perilous world.

Creatures large and small, from the bison to the ephydrid fly, make use of hot springs to survive the coldest winter months. Others, like the bears, hibernate, emerging ravenous when the weather finally warms, and ready to scrap for whatever food they can find.