When the Panamanian golden frogs of the rainforest want to communicate, they simply wave a webbed foot in the general direction of the object of their affection.
It's quite romantic, actually, the amphibian equivalent of fluttering eyelashes. We observed this and many other rituals of the animal kingdom in Attenborough's Fabulous Frogs, an overview of all things batrachian, and the last instalment in Attenborough's current Natural World series.
Frogs were the first creatures Attenborough kept as pets, and he promised that we too would find them "truly fascinating".
Given his decades-spanning career in nature documentaries, it's fair to assume Attenborough finds every living thing "truly fascinating", so it was still a surprise to find so much to charm in the world's 5,000-plus frog and toad species (the two terms are largely interchangeable, apparently).
The only problem was deciding which feat was most impressive: the toad that bounces like a rubber ball to avoid predators, or that Attenborough's clever team managed to capture the whole thing on camera.