Nature & Nova | September 2021

Meet the animals who will steal, cheat and fight to get food.
Some animals will do whatever it takes to survive. Cockatoos turn to vandalism, boxer crabs hold anemones hostage, sloths become filthy, puff adders have an "invisibility cloak" to hide themselves, and chimps use violence to stay in power.
Airdates:
Getting ahead in the mating game requires some astonishing behavior from promiscuous prairie dogs, to backstabbing manakins, kidnapping macaques, and hyenas with a bad case of sibling rivalry.
Airdates:
Getting ahead in the mating game requires some astonishing behavior.
Meet the many species of remarkable rabbits and the scientists working to save them.
There are more than 100 types of rabbits and hares, both domestic and wild, from snowshoe hares to Flemish giants. Despite their extraordinary ability to reproduce, many wild rabbits are in danger of being eradicated.
Airdates:
For animals in Mozambique’s Gorongosa National Park, the normal balance of competition and predation was upended when a war wiped out the top predators. The remaining animals didn’t simply grow in numbers—they began behaving in unusual ways, veering outside their typical territories and feeding patterns.
Airdates:
Can bringing predators—and fear—back into an ecosystem help restore its natural balance?
NOVA uncovers the secrets of nature’s battleground—claws, horns, fangs and all.
From lobster claws and dog teeth to bee stings and snake fangs, every creature depends on a weapon. Some are armed to extremes that make no practical sense—whether it’s bull elks with giant 40-pound antler racks or tiny rhinoceros beetles with horns bigger than their body. What explains giant tusks, horns and claws that can slow an animal down and even impair health and nutrition?
Airdates:
Bats have a sinister reputation as the source of some of the world’s deadliest viruses: Ebola, MERS, SARS, and most recently, SARS-CoV-2. They are resistant to the very diseases they carry, have freakishly long lifespans, and are also resistant to other diseases like cancer. By understanding these unique creatures, they might unlock the key for humans to live longer, healthier lives.
Airdates:
Could the source of the deadliest viruses hold the secret to a healthier and longer life?
As state-legalized cannabis spreads, NOVA explores its little-known risks and benefits.
A huge social experiment is underway. Fifty-five million Americans say they currently use cannabis, and that number is expected to grow as voters push for legalization in more and more states. Though many believe cannabis is benign, and even beneficial, the federal government classifies it—like heroin—as a Schedule 1 drug, one that has no medical uses and poses serious safety concerns.
Airdates: