The animal kingdom: how animals are classified
Animal species: how many different kinds of animals are there?
Size: from the small to the gigantic
Biomass: how much do all the termites in the world weigh?
More biomass: the world's heavyweight champions
Speed: what are the fastest animals?
Wingbeats: staying airborne
Sleep: how many hours a night?
Life spans: from one day to 500 years
Heart rate: fast and slow
Horns: different shapes and sizes, all with a sharp point
Tongues: for reaching-or catching-a meal
Animal sounds: loud and louder
Defenses: how an armadillo stays safe
Poisonous or venomous?: the most toxic animals in the world
Deadly animals: human deaths caused by animals
Deadlier: the most dangerous of all
High and low: living on a mountain top or deep in the sea
Hot and cold: surviving in extremes
Migration: animal journeys
Mass extinctions: life's greatest disasters
Endangered animals: almost gone.
