Typically 4-6 eggs are laid. The average is 4.7, and clutches laid earlier in the year are usually larger than later ones. Not all the eggs hatch t...

Most bird species don’t start to incubate (sit on and warm) their eggs until the clutch is complete, so the eggs hatch at more or less the same tim...

Barn Owls do not “build” a nest as such but lay their eggs directly onto the previous years’ nest debris – a compacted layer of owl pellets. The fe...

About 10% of pairs may breed twice in one year – although the proportion that does so varies tremendously from year to year. Records even exist of...