Speculation is running high over the next big event in our story.
Osprey eggs hatch in the same order as they are laid. It takes about 35-37 days for the chicks to emerge, but cases have been recorded of up to 43 days.
How well the parent birds carry out their incubation duties influence hatch dates.
Harriett and Jonathan have been breeding together for years. It shows in their coordinated coverage of the nest.
Does wet rainy weather effect hatch dates? The Doctor does not know.
So, taking all that into account, the Doctor is predicting that the first egg will hatch tomorrow.