Section: Reading

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What does the author mean by stating that "Their downcurved beak is an advantage in killing the prey" (lines 8-9)?

1. The cuckoos' beak impedes catching the prey.
2. The shape of the cuckoos' beak threatens the prey.
3. The cuckoos' curved beak overwhelms the trapped prey.
4. The cuckoos' beak is a benefit in capturing the prey.