Film These are adorable. The British Library's Spring festival in March was an exhibition and gathering together of various types of culture inspired by their collection. Just uploaded to their YouTube channels are these two films created, presumably, for the festival, both expressing the library's "weird and wonderful wildlife sounds".
The first, The Ogre Hunters by Luke Rodgers, stars Prunella Scales and Timothy West:
The other is this Katherine Blakeney animation:
Most of it is silent, so don't adjust your speakers.