Seahorse

It's easy to assume all animals have a neat dividing line between the sexes because the differences in appearance between males and females can be so striking. But the more scientists learn about wildlife, the clearer it is that nature doesn't have a rule book.

In seahorses and pipefish, it is the male that gets pregnant and gives birth. Seahorse fathers incubate their developing embryos in a pouch located on their tail.

Zinc-filled oysters are often linked to improved libido and sexual activity, and now scientists at Flinders University are calling for more serious investigations into how marine organism compounds can help human fertility.

It might surprise you to know that the River Thames is considered one of the world's cleanest rivers running through a city. What's even more surprising is that it reached that status just 60 years after being declared "biologically dead" by scientists at London's Natural History Museum. Yet despite this remarkable recovery, there's no room for complacency—the Thames still faces new and increasing threats from pollution, plastic and a rising population.

Iconic African wildlife such as elephants, big cats and rosewood trees will be central to discussions of the World Wildlife Conference slated for Panama later this year.