This rich biodiversity creates a complex world where animals, plants and people interact.

Some animals are interacting or fighting or stepping on each other.

And they pay special attention to the ways in which individual animals interact with one another to form social groups.

We'll see how the animal interacts with them.

These animals also begin to move, and interact with each other until a large red animal arrives.

These animals interact in their ecosystem and adapt to live in their habitat.

The animals in the stories interact with people and frequently change between human and animal form.

"Sometimes the animals interact with each other - but that may only be in my mind."

Although home ranges may overlap, the animals remain generally solitary outside of the breeding season, and only rarely interact.

Broadcast 29 November 1990, this instalment investigates the ways in which those animals that live in social groups interact with each other.