短语讲解：

1. There are more than 40 species of crows and ravens, a similar bird.

more than 超过;不只是;很;在…次以上
例句：He supervised and trained more than 400 volunteers.
他指导和培训了400多名志愿者。

2. He said finding out that the crows use tools is an important discovery.

find out 发现;使发作;使受惩罚
例句：I hope we can find out about it.
我希望我们能查清此事。

3. The Alala crows also showed that they are willing to steal from each other.

be willing to 乐于;肯;甘于
例句：You must be willing to reskill.
你必须乐于学习新技术。