From: BBC Nature on Wed, Feb 16 2011 10:28 PM

Owls struggle to retain their territorial investments.

From: BBC Nature on Wed, Feb 16 2011 10:28 PM

Dragonflies and damselflies are one of the most ancient life forms on land.

From: BBC Nature on Wed, Feb 16 2011 10:28 PM

Iolo Williams gets up at dawn to watch a remarkable black grouse lek near Llangollen, in North Wales.

From: BBC Nature on Wed, Feb 16 2011 10:28 PM

Male black grouse scuffle over their display grounds.

From: BBC Nature on Wed, Feb 16 2011 10:28 PM

Kittiwakes are the doves of the gull world and give gulls a good name.

From: BBC Nature on Wed, Feb 16 2011 10:27 PM

The shocking truth behind a much-loved bird is revealed on camera.

From: BBC Nature on Wed, Feb 16 2011 10:27 PM

Life as a live in warden at the tern colony on the Skerries.

From: BBC Nature on Wed, Feb 16 2011 10:27 PM

A lucky dip for Bill Oddie as he nets a female crayfish.

From: BBC Nature on Wed, Feb 16 2011 10:27 PM

Two females engage in a battle to the death in defence of mate and territory.

From: BBC Nature on Wed, Feb 16 2011 10:27 PM

Jaws were a significant development in the evolution of fish.

From: BBC Nature on Wed, Feb 16 2011 10:26 PM

All backboned animals, even humans, are descended from sea squirts and slimy hagfish.

From: BBC Nature on Wed, Feb 16 2011 10:26 PM

Skomer’s native puffins boot rabbits out of their five star burrows.

From: BBC Nature on Wed, Feb 16 2011 10:26 PM

Scientist Lynn Rogers introduces Gordon Buchanan to Lily and her cub Hope.

From: BBC Nature on Wed, Feb 16 2011 10:26 PM

Bill Oddie reluctantly takes to a boat in search of St Kilda’s puffins.

From: BBC Nature on Wed, Feb 16 2011 10:26 PM

Steve Backshall catches up with a young caiman hiding out in the reeds and rushes.

From: BBC Nature on Wed, Feb 16 2011 10:26 PM

Echo sends in the herd heavies to retrieve Ebony.

From: BBC Nature on Wed, Feb 16 2011 10:26 PM

Male ducks expend all their autumn energy in impressing the ladies.

From: BBC Nature on Wed, Feb 16 2011 10:26 PM

Tar pits reveal evidence of huge mastodons and two-tonne, armour-plated sloths.

From: BBC Nature on Wed, Feb 16 2011 10:25 PM

Chris Packham dons a fetching wetsuit to meet the fish in the River Wensum.

From: BBC Nature on Wed, Feb 16 2011 10:25 PM

Huge male black bears turn up for close inspection at the research institute.