When the two osprey chicks at Cumbria Wildlife Trust’s Foulshaw Moss reserve were ringed, chick number one (Blue 3N), affectionately known as Biggie, was the largest we’d ever seen!
An adult male osprey weighs 1500 to 1700 grams. Females are about 15% bigger. Even so, at only 6 weeks, this lass was already 1810 grams.
This may be because only two of three eggs hatched. Eggs are laid at two-three day intervals. Egg 2 failed, so there were 5 days between the two hatchlings.