We examine how things taste, and how vital scent is from the animal perspective. But their sense of smell will also detect the scent of odorants carried through the air. In mammals, taste receptor cells are scattered over the tongue but how they work underwater, well, it's a whole other world.
Watching the fascinating display of leafcutter ants at the Natural History Museum in London is one of my favourite ways to while away a few hours, but David Attenborough is operating on a much grander scale here in the last in the series. In Argentina he observes some cousins of the leafcutters who are part of a community so vast it spans an entire continent. It’s one of the mandible-dropping facts in a look at one of the key inventions of arthropods: colonies. From termites and honey bees to the leafcutters, it seems that if you want to get ahead, you move to the big city.