英语听力：自然百科 黄石公园的夏天 Yellowstone—10

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Bison can shrug² off this sudden change in the weather; they are after all built to survive the Yellowstone winter.

 

But this tiny hummingbird³ is more vulnerable. Flowers damaged by snow will die, and the nectar the hummingbird needs goes with them. Hummingbirds⁴ must be resourceful to survive.

 

Bark wells dug by a sapsucker, a type of woodpecker, quickly fill with / sugar-rich sap as soon as the warm weather returns.

 

A little pilfering⁵ provides this hummingbird with the energy it needs until the new flower buds open. 

 

Summer moves quickly. By late June, the blizzards⁶ of a few weeks before seem/ a distant memory.

 

At last the summer is well enough established for this hummingbird to take the plunge⁷ and raise a brood.

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