Animals Alive. The Fight for Survival in the Wild 2011

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Animalscome in every shape, size, and color. They roam the land, swim in water, andfly in the air. There are millionsof different animals and every one
has its own role to play in the natural world. To survive,every animal needs food, shelter, water, and living space. The place where it finds these is known as its habitat. Habitatscan be as small as a muddy puddle or as vast as an ocean. Some animals can only live in very specific habitats, while others can live almost anywhere.
If scientists’ best estimates that there are up to 10 million animal species living on this planet are correct, where have they all come from and why are there so many? And why do some species survive while others perish?