🎤 TPO-75 口语 Task 4

讲座原文（参考）

Let's continue the discussion on roosting. That is the resting and sleeping behavior of winged animals. Today, we'll talk about roosting behavior in bats, which roost in large groups.

Bats roost by hanging upside down with their feet above their heads, from the roofs of caves, from trees, or from undersides of bridges. Their roosting behavior is actually quite important for their survival. How?

作用1：帮助捕食

Well, bats like other animals need to eat to survive. They feed on a variety of insects which they have to chase and catch in flight. So they must be ready to fly.

However, unlike birds, bats are not able to launch themselves into the air. They can't take off from the ground, but remember that they roost in high places. They use their front claws to climb to a high place, like the roof of a cave to roost, because they hang upside down from high locations. They can easily start to fly by simply releasing their grip, letting go of whatever they were clinging to. Then they're immediately in the air ready to chase, catch and eat flying insects.

作用2：躲避天敌

In addition, roosting provides a way for bats to hide from danger, it protects them from predators. When bats are resting or sleeping, they can be easily attacked by predators like snakes and cats. Can they defend themselves against these attacks while sleeping? Well, no.

This is where roosting helps. By hanging upside down so far above the ground, these predators, snakes, and cats, can't reach and attack them. The bats can rest and sleep safely.

The lecture discusses roosting behavior in bats and explains two ways it helps them survive. 主题

First, roosting helps bats catch food. 要点

Bats eat insects that fly, but unlike birds, they can't take off from the ground. 问题

By hanging upside down in high places, they can simply release their grip and immediately be in the air ready to chase and catch insects. 解决方案+结果

Second, roosting protects bats from predators. 要点

When bats sleep, they're vulnerable to attacks from animals like snakes and cats, and they can't defend themselves. 问题

However, by hanging upside down high above the ground, these predators can't reach them, so bats can rest safely. 解决方案+结果

So roosting is important for both feeding and protection. 总结

The lecture discusses roosting behavior in bats and explains two ways it helps them survive.

First, roosting helps bats catch food. Bats need to eat insects that fly in the air, but unlike birds, they cannot take off from the ground. So they roost by hanging upside down in high places like cave roofs. When they need to hunt, they can simply release their grip and immediately be in the air, ready to chase and catch flying insects.

Second, roosting protects bats from predators. When bats are resting or sleeping, they are vulnerable to attacks from animals like snakes and cats, and they cannot defend themselves. However, by hanging upside down high above the ground, these predators cannot reach them. This allows bats to rest and sleep safely without being attacked.

So roosting is important for both feeding and protection from danger.