Revealing the Rainforest

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Lek: a group of male animals that have gathered to show off to females.

Mutualism: an interaction between two organisms that benefits both of them. Sometimes one of the two organisms lives and multiplies into the other one, which is called the host.

Sexual reproduction: when two organisms join their genetic material (often eggs and sperm) to make a new organism.

Brown-throated sloth

This brown-throated sloth is well adapted to the rainforest. Click for more detail.

The rainforest is home to lots of species of animals. So many different animals live here that by looking at the rainforest, we have a chance to study adaptations and interactions that may not be found anywhere else.

Ants in Your Plants

Humans and plants have an interesting relationship—we depend on plants for food, for some medicines, and for decoration and even stress relief, if we have houseplants. However, some ants that live in the rainforest have even more complex, or involved, relationships with plants.

Leaf-cutter ants

Leaf-cutter ants gather leaves to help their fungus gardens grow, producing food for baby ants. Image by Geoff Gallice.

Leafcutter ants are little farmers in the rainforest. They cut pieces of leaves off of plants and carry them into storage spaces underground. Here, the ants use the leaf chunks as food to feed another organism—a fungus.

They grow this fungus to feed baby ants, called larvae. The fungus depends on the ants to bring them food, and the ants depend on the fungus to help ant larvae grow. This type of relationship, in which both species benefit, is called mutualism.

Pint-sized Pools

poison dart frog parental care

This three-striped poison dart frog is carrying its tadpoles to a new tiny pool. Image by Devot.

Like ants, some frogs in the rainforest depend on plants to help their babies, or young, grow. Colorful frogs called poison dart frogs depend on tiny pockets of water that gather in the leaves or branching stems of certain plants, especially epiphytes.

After their eggs hatch into tadpoles, the parent frogs move the tadpoles into these water pockets. If a pool runs out of food, or if the water level gets too low, the poison dart frog will carry the tadpoles on its back to a new plant with a larger pocket of water.

These devoted parents may also lay eggs that have no young tadpoles as food for their young. 

Show Offs

Though relationships between different species in the rainforest can be interesting, the most amazing things you see in the rainforest are sometimes between a male and female of the same animal species. When some animals are looking to reproduce, or have babies, they need to attract another animal with which they can mate. Oftentimes, in species that have sexual reproduction, it is the male that tries to attract a female.

red and black cock of the rock bird

Male cock-of-the-rocks' bright colors are difficult for females, or anyone else, to miss. Image by Marie de Carne.

Some males attract females with amazing dances or colors, using tricks to try to show off for, or impress, a female. The cock-of-the-rock, a type of bird that lives in the undergrowth of the forest, has males with bright red and black color patterns. Five to 20 of these bright males fly, dance and call together in a group called a lek. These birds dance in a small area to try to attract one of the dull-colored females.

When a female arrives at the dancing grounds, the males dance and call even harder. Even with up to 20 males calling, only one male wins out—usually the brightest, the loudest, or the best dancer.

With all the different bright display colors of some animals, the dark, shadowy, green rainforest can be transformed into a beautiful show of moving colors.

Images via Wikimedia commons. Additional image by USFW.

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Bibliographic details:

  • Article: Animals of the Rainforest
  • Author(s): Karla Moeller
  • Publisher: Arizona State University School of Life Sciences Ask A Biologist
  • Site name: ASU - Ask A Biologist
  • Date published: July 24, 2013
  • Date accessed: May 21, 2024
  • Link:

APA Style

Karla Moeller. (2013, July 24). Animals of the Rainforest. ASU - Ask A Biologist. Retrieved May 21, 2024 from

American Psychological Association. For more info, see

Chicago Manual of Style

Karla Moeller. "Animals of the Rainforest". ASU - Ask A Biologist. 24 July, 2013.

MLA 2017 Style

Karla Moeller. "Animals of the Rainforest". ASU - Ask A Biologist. 24 Jul 2013. ASU - Ask A Biologist, Web. 21 May 2024.

Modern Language Association, 7th Ed. For more info, see

The rainforest holds all kinds of exotic animals, like this ocelot.

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