It was wren ballet, wren theatre, wren war . . . Wanderlust, intense mutual competition, aggressive territoriality, blindness to the existence of anything but themselves, all this combined with a male interest in engineering and female obsession with interior decor: it is an intriguingly human set of qualities. The strangest sight I have seen all the year was during the summer, in an enormous seabird colony in the Hebrides. All round me, the puffins, razorbills and guillemots were hacking and growling at each other, standing in offended silence or simply coming and going, their babies cheeping deep within the boulders of the colony, the rocks coated in guanoed slime, the shags hissing and honking at me like demented witches, a stinking, ammonia-thick and frankly hellish place.