In this clip from the BBC's David Tennant-narrated documentary Polar Bear - Spy On The Ice, a female polar bear seduces a mate by adorably burying her head in the snow...and intermittently flashing him. Oh, you saucy Ursus maritimus.

And here's more footage of the bears gleefully destroying the BBC's ice-camouflaged spy cameras.

[John Dower Productions via Buzzfeed]