The Port Jackson shark, Heterodontus portjacksoni, reproduces through internal fertilisation. Initial embryonic development is internal with each embryo surrounded by an egg case. These capsules are then laid into the external environment where development continues until hatching. This is similar to the reproductive pattern of which mammals?

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Monotremes, like the platypus and echidna, are the only mammals that lay eggs, similar to the Port Jackson shark's method of laying egg cases for external development.

The Port Jackson Shark, Heterodontus Portjacksoni, Reproduces Through Internal Fertilisation