Grebes' nest
 1 Crested grebe, River Thames, 11 June 2006 |
 2 Crested grebe, River Thames, 11 June 2006 |
 3 Crested grebe, River Thames, 11 June 2006 |
 4 Grebes' nest |
 5 Offering twigs for nest |
 6 Parents prepare to swap over for egg duty |
 7 Preparing for swap |
 8 Egg carefully arranged for swap-over |
 9 Swapping places |
 10 Swapping places |
 11 Another nest |