Fried egg jellyfish

It has algae living inside its body, which use sunlight to make energy that the jellyfish can use and store.1

Researchers have studied its effects on certain breast cancer cells, though much more work is still needed.1

Its young cannot develop properly without these algae, as the algae help start the early stage of adult form.1

Its mouth arms carry sperm to females, which fertilise the eggs inside them.1

Its population grows into large blooms every summer, and it has a yearly life cycle.1