amnionic eggs
Most reptile eggs are leathery to protect them when laid in holes where they drop into contact with other eggs and it serves to make them more resiliant when covring the eggs with sand, dirt and other debris to conceal them.
A leathery shell is a protective covering made of tough and flexible material, resembling leather. It is found on certain types of fruits, seeds, and animals such as turtles and tortoises. This type of shell provides protection and support to the organism.
The adaptation of laying eggs with a tough leathery watertight shell would be well-suited for a terrestrial environment, such as a desert or forest. This type of egg shell helps protect the eggs from drying out in arid conditions and from external environmental threats in a terrestrial setting.
To eat their food, which in their world is usually fresh meat. So the sharp teeth cuts and tears through the tough leathery skin digging down into the muscle. Then his teeth help him rip and cut the meaty muscle off bones.
Snakes are reptiles because they are cold-blooded, have tough skin or scales, and usually lay eggs with an amniotic sac. (In rare occasions do they have live births due to special reasons, still using an amniotic sac.)
A reptile egg is much much much softer than birds egg.
Generally, they will have tough, leathery skin.
Very tough, leathery skin.
The rough, thick, and leathery meningeal layer is the dura mater.
Most reptile eggs are leathery to protect them when laid in holes where they drop into contact with other eggs and it serves to make them more resiliant when covring the eggs with sand, dirt and other debris to conceal them.
amnionic eggs
Because they only can produce little offspring, unlike fish who produce millions of eggs and fertilize them afterward. Also, reptile and bird egg shells are tough making it hard to fertilize when fish eggs are more like jelly.
They have 2 toes per foot and the bottoms of their feet are padded with tough leathery soles to protect them from sharp rocks.
Sick or elderly birds may, but healthy birds can survive tough winters.
"Styela clava has a long, club-shaped body on a tough stalk. Its surface is tough, leathery, rumpled, and nobbly. They can be brownish-white, yellowish-brown, or reddish-brown."http://www.niwascience.co.nz/ncabb/tools/sea_squirt
Leaf cutter ants avoid plants that produce toxic chemicals or have tough, leathery leaves when foraging for food.
A leathery shell is a protective covering made of tough and flexible material, resembling leather. It is found on certain types of fruits, seeds, and animals such as turtles and tortoises. This type of shell provides protection and support to the organism.