Animal Reproduction PP Part 1

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Birds have a CLOACA too!

But they take care of the eggs and the chicks (some exceptions)

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Birds

Brood Parasites- female bird lays her eggs in the nest of another species so she doesn’t have to take care of it.

A Reed Warbler feeds a baby Cuckoo.

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Birds

Do you think birds evolved from reptiles? Why?

Endangered Ground Hornbill Chick

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Fish

A female fish lays eggs then the male comes by and fertilizes them. This is called SPAWNING. They have a yolk sac like birds and reptiles and no parenting…unlike Nemo.

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Sharks

Sharks don’t spawn like other fish. They reproduce sexually like other animals. Then they take one of three options.

Lay eggs in the water like other fish.

When found on shore, these are called Mermaid’s Purse or Devil’s Purse

Small-spotted Catshark egg case

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Sharks

Crested bullhead shark

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Sharks

Or they can then…

Eggs hatch inside the mother and chill out, eating from their yolk until they are born.

These were found inside a Porbeagle shark…yolk, no shell.

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Sharks

Or they can then…

Their yolk attaches to the mom’s uterus and becomes a placenta…taking nutrients from the mom until they are born,

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Sharks are definitely swag!