The lower bill of the hummingbird makes a nectar-drinking beak into one for catching insects.
Conspicuous armaments are good visual proxies for fighting ability.
Bats, reservoirs for such viruses as Ebola, are increasingly villainized and require special conservation.
After centuries of moving through the Irish countryside, a group known as Travellers has come to rest.
Algae, plants and humans: three groups of organisms that used chemistry to change the planet.