"The cows eat the grass down, but they also eat things ... "Many species have adapted to living in the heathland environment - plants, butterflies, insects and a lot of bird species," he said.

Animals that eat plants are called herbivores. As they eat a diet of grass and clover, cows are classed as herbivores. The name for animals that eat meat and plants. Rats eat plants, seeds ...

In far Northern California, beneath a towering mountain ridge still covered in April snow, one of the state's last cowboys ...