英语听力：自然百科黄石公园的夏天 Yellowstone

This female grew up on the lake, so she knows where to take the cubs for a very special trip.

Yellowstone cutthroat trout are massing in the mouth of the stream that feeds the lake.

They are preparing for their annual spawning. But the trout must wait, the stream is still running

fast, too turbulent to lay their eggs. It's a nervous time for them, and for good reason.

This osprey has a brood to feed and will be back. Now the otters are here, too. She chooses her

moment to lead the pups up stream, then leaves them to watch and give them a lesson in

hunting. A large trout like this, full of eggs, is a trophy catch.