Large sharks have live young that can look after themselves when they are born. Many of the smaller sharks around the southern coast of Australia lay large eggs. The egg cases are soft when laid but quickly harden and become very strong. They are well camouflaged usually being the same colour and shape as seaweed.
Each species of shark that lays eggs has a different shaped egg. Port Jackson sharks has large spiral looking eggs.
The female uses her mouth to wedge the eggs into rock crevices. The shape of the egg helps it to remain wedged in the rocks. It will take 10 to 12 months for a Port Jackson shark egg to hatch.
Shark eggs are often washed up onto the beach or found in rockpools. If the eggs have not hatched, leave them in the rockpool.