McALLEN, Texas — Birds care nothing for international borders, but big bodies of water give them pause.The Gulf of Mexico squeezes two major migratory flyways through southern Texas, where the subtropical climate, attractive habitats and plentiful fresh water invite thousands to stay for at least a brief layover before or after they cross the U.S.-Mexico border.And where there are birds, there are bird-watchers.Human visitors flock to the lower Rio Grande Valley to spot the broad- [...]
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