Summary
The drop is linked to rising temperatures and loss of natural homes.
They are studying the birds to find ways to protect them.
Bird counts show a steady decline each winter.
Climate change means warmer winters, which many birds dislike.
Habitat degradation means trees and wetlands are disappearing.
Researchers are planning ways to keep safe spots for the birds.
The drop is linked to rising temperatures and loss of natural homes.
They are studying the birds to find ways to protect them.
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