Drought may make butterflies' migration difficult

  

Millions of monarch butterflies are on the move right now, heading from the United States to central Mexico for the winter. But this year's drought in Texas is making their trip more difficult.

The drought means flowering gardens are few and far between. The monarchs need nectar to fuel their yearly trip south.

In late December, scientists in Mexico will measure the butterfly population based on the amount of forest they cover. They say this year, the numbers could be lower.

Experts are also concerned because the Texas drought is expected to continue in the spring when the monarchs return north to reproduce.

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