Jan Hamrsky / Case-building caddisfly larva (Trichoptera), Europe, June. Controlled conditions.

Nick Upton / Stream dammed with tree branches cut and stripped of bark by Eurasian beavers (Castor fiber) in the grounds of Bamff estate, with arable farmland in the background, Alyth, Perthshire, Tayside, Scotlan...

Alex Hyde / Paper wasps (Polistinae) at nest attached to underside of leaf with eggs visible in paper cells, Osa Peninsula, Costa Rica

Paul D Stewart / Shell of extant deep water squid Spirula (Spirula spirula) backlit and sectioned to show how the structure of partitions within the shell is reminiscent of the extinct ammonites and living nautiloids.

Paul D Stewart / Flame bowerbird (Sericulus aureus) male decorating bower with berries to attract females, Papua New Guinea.

Paul D Stewart / Flame bowerbird (Sericulus aureus) male with bower with berries, Papua New Guinea

Tony Heald / Rufous Hornero / Ovenbird (Furnarius rufus) perched on nest, Pantanal, Brazil

Nick Upton / Eurasian beaver (Castor fiber) placing a branch stripped of bark on its dam in woodland enclosure at night, Devon Beaver Project, run by Devon Wildlife Trust, Devon, UK, April. Taken by a remote camer...