21.   They are a long-lived species and a pair will not lay eggs every year.

22.   They lay their eggs in midwinter, incubating their eggs and chicks through many blizzards.

23.   Turtles lay their eggs on the beach at night.

24.   Within an hour or so of reaching the pond and becoming clasped in amplexus, females start to lay their eggs.

25.   Within it, they copulate and lay eggs.

26.   He prods her rump as she enters it, stimulus for her to lay her eggs.

27.   Female birds have a single ovary and they lay calcareous eggs.

28.   These lay their eggs in the nests of other birds, which then act as unwitting foster parents.

29.   The adult worms in the larger pulmonary vessels lay eggs which are carried to the capillaries, where they hatch.

30.   How often do ducks lay eggs?