pesachim 55

life is messy

but you can groom and clean up the messes of life on chol hamoed and eruv pesach
and
allow the eggs to crack for new life to hatch

(this page discuss the work that is permitted on eruv pesach and chol hamoed, the middle days of the festival. they include grooming - haircut, tailoring, shoe-repairs and laundry. and cleaning up the animal dung in the courtyard. and moving hens and eggs to allow them to hatch)