You can always tell when we're nearing hatching time - the 24hr Protection volunteers start smiling again and cracking jokes. Well, some of them anyway.
Yesterday morning (Tuesday, 24th May) we saw the first crack in Egg No1. By mid afternoon it had evolved into a 5mm hole and by 8pm we could clearly see an egg tooth chipping away at the egg shell as the chick attempted to break free.
Here's 15 hours condensed into two minutes: