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Ecosystem

Cowbirds lay ...

Question

Cowbirds lay their eggs in the nests of smaller birds. The fast-developing cowbird chicks hatch first, then push the other baby chicks out of the nest as they hatch. What type of ecological interaction is observed in this case?

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Solution

Parasitism is observed in this given example. A parasite is an organism that lives on or in a host organism and gets its food and nutrition from or at the expense of its host.
Since the parasitic mode of life ensures free lodging and meals, the cowbird chick is fast developing in the nest of the smaller bird and also pushes smaller bird’s chicks, it is a parasite for the smaller bird chicks.

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Read the passage and answer the following question.

An investigator went to Central America to study oropendolas, which are communal nesting birds. Another species of bird, the cowbird, sometimes lay its eggs in the nests of oropendolas. Some of the populations of oropendolas throw the cowbird eggs out of the nest, and some don't. The investigator was interested in finding out why some birds would raise other species as their own but others would toss them out. By watching the nests closely, he found that blowflies lay their eggs in the nests of oropendolas and that the young larvae, maggots, feed on the young birds. If young cowbirds are in the nest, the precocious cowbirds eat the blowfly larvae, protecting the young oropendolas. In colonies of oropendolas that discriminate against cowbirds, throwing them from the nest, the blowflies are not eaten by cowbirds. These colonies of oropendolas build their nests close to a particular wasp colony, and the wasps eat the blowflies.
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______ bird lays its eggs in crow's nest and crow hatches them along with its own eggs.

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