Question

unusual bird parenting
birds have a reputation as excellent parents. they expend a great deal of effort in building nests in which to lay their eggs. they patiently incubate the eggs, keeping them warm and safe until they hatch. birds also bring food to their newly hatched offspring until the baby birds are independent. however, some unusual birds, known as brood parasites, dont provide any parental care for their young. perhaps the most famous brood parasite is the cuckoo. instead of building a nest, the cuckoo lays her eggs in the nest of another species with similar-looking eggs. the female cuckoo simply removes an egg laid by the host female, lays her own egg, and then leaves, expecting the host bird to care for the imposter.

what is the main, or central, idea of the passage?

unlike most species of birds, brood parasites such as the cuckoo dont build nests.

most birds build nests for their young, incubate the eggs, and are generally devoted parents.

unlike most species of birds, brood parasites such as the cuckoo dont provide any parental care.

Explanation:

1. Analyze the first option: The passage's main idea isn't just about brood parasites not building nests. The key point is about parental care, and not building nests is part of their lack of parental care. So this option is too narrow.
2. Analyze the second option: This option describes the general behavior of most birds, but the passage also introduces the exception (brood parasites) and focuses on their different parenting behavior. So this option only covers part of the passage.
3. Analyze the third option: The passage first states that most birds are good parents, then introduces brood parasites (like cuckoo) that don't provide parental care. This option captures the main contrast and the central idea of the passage.

Answer:

Unlike most species of birds, brood parasites such as the cuckoo don't provide any parental care.