Right here in the US we have one of the most unique relationships between a plant and an animal anywhere in the world. Sarracenia purpurea is a plant that survives by eating insects, and Wyeomyia smithii is a species of mosquito that lives no where else on earth than right in the digestive urn of this plant.
As you can see in the photo from one of my specimens, the plant has leaves shaped like urns, and downwards pointing hairs that keep insects which crawl or fly in for a drink of water from coming out again. The insect dies, and is digested. But the relationship of enzymes to water is so high in this plant compared to other Pitcher Plants that it benefits from a certain mosquito.
The mosquito lays it's eggs in the urn, and in it's larval form eats from the dead insects that the plant has killed, concentrating the nutrients in it's waste to a form more readily used by the plant. And the plant naturally is the perfect place for a young mosquito to live; it's not like it has to watch out for fish or anything!
In the two bottom urns, notice the dark spots, which are captured insects. I've had this plant from a seedling many years ago, and have never had to feed it.
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