Declining numbers mean the continent's top predator isn't fulfilling its ecological role.
With El Niño ramping up, Australia is in for a long, hot, dry summer - perfect conditions for blue-green algae. And that innocuous-looking pond scum can pack a toxic punch if you're not careful.
They might keep the environment clean and healthy but most species are in steep decline.
Viewing human migration through the lens of natural history makes one thing clear: society needs to prepare for more migrations of people and the species we depend on.
For decades, canals were an unloved relic of industrial Britain – but people power has brought them back to life.
Far from the expected development, forestry plantations and other carbon market initiatives in Uganda have severely compromised ecologies and livelihoods of the local people.
The continent's ice caps are melting, and both native and alien species will soon colonise the newly uncovered areas.
'Theiving magpies' obsessed with glitter but what's the truth amid the folklore?
Many ecosystems have changed so radically that it is no longer possible to restore them to what they once were and in other situations it is not appropriate.
Early warning systems are available for things like tsunamis and diseases. Why not for animals as well?
The decisions an animal makes when escaping a predator can mean the difference between life or death.
By filming these ultra-speedy feeders at transparent fake flowers, researchers finally figured out how hummingbirds slurp up the nectar so fast.
A rash of white shark attacks this summer points to a rebounding population in the US – a sign of healthier oceans and the need to coexist with this apex predator.
The pope's encyclical Laudato Si' tells us to protect nature and act on climate change for more than reasons of self interest.
The pope's encyclical challenges the belief in markets to solve social ills – a difficult message for Catholic Republican presidential candidates to accept.
By equating human rights to the protection of nature, the pope's encyclical opens up an international debate with broad political implications.
The pope's encyclical turns climate change into a moral discussion by focusing on the disproportionate impact of climate change on poor countries and regions.
A "Pleistocene Park" might be a more realistic scenario.
Rapid changes in technology are transforming the contributions ordinary citizens can make to scientific research.
Sometimes the best way to deal with mountains of data is to turn to the public for help. That's what Snapshot Serengeti did to classify millions of photos from savanna camera traps in Tanzania.