sentence: Eggs laid by snakes generally have leathery shells which often adhere to one another.
sentences_before: While many reptiles lay eggs with flexible, calcified, eggshells, there are some that lay hard eggs.
sentences_after: Depending on the species, turtles and tortoises lay hard or soft eggs. Several species lay eggs which are nearly the same as bird eggs.
concept_name: egg
headings: Eggshell Amniotes Reptile eggs
categories: Tetrapods