Kinosternids lay about four hard-shelled eggs during the late spring and early summer.

An eggshell is the outer covering of a hard-shelled egg and of some forms of eggs with soft outer coats.

The female lays one hard-shelled egg that can be as large as her head.

Breeding occurs in the spring, and females lay two to 9 elliptical, hard-shelled eggs in a shallow burrow or under shoreline debris.

They lay hard-shelled eggs.

Reptiles, in the traditional sense of the term, are defined as animals that have scales or scutes, lay land-based hard-shelled eggs, and possess ectothermic metabolisms.

Even though humans do not lay hard-shelled eggs, there is still a watertight membrane, or amnion, in the fertilized eggs inside human females.

The hard-shelled eggs are laid under loose bark, in crevasses or buried in a slightly moist spot.

The females lay their hard-shelled spherical eggs in the soil in May and June.