The games begin for keepers when orangutan Malu destroys his playroom. An elderly horse must undergo a risky procedure, and keepers must decide if it’s time to say goodbye to one of the zoo’s beloved giraffes.

The world’s rivers are one of the most dynamic battlegrounds in nature.

Deserts are Earth’s hottest battlefields, and can turn predator into prey.

Life and death dramas take place in the oceans and seas of the world.

The sky is a battlefield where predator and prey fight against gravity.

Wetlands create a landscape in constant flux, merging wildlife combatants.

Grasslands are the classic battleground providing an open field of combat.

Frozen seas of the Arctic are the most inhospitable battlegrounds on Earth.

Jungles stage a multidimensional battleground between predator and prey.

The coastlines of the world create a distinctive and brutal battlefield.

Islands provide a distinctive, isolated theater for predator and prey.

Darkness and light are two factors that affect every battlefield.

The Arctic tundra is the largest and most bleak battlefield on Earth.

A crowded city's food supply is an alluring attraction for hungry animals.

Paul and Jimmy clash over expanding to include alligator wrestling shows.