Scientists suspect that subtle biological tools help guide remarkable bird migrations over thousands of miles.

Spring bird migration is so smokin’ hot right now ... they're headed Some people have taken photos of the moon and gotten silhouettes of the birds passing by, she says. “It’s cool to watch ...

Swallow-tailed kites and their very distinct silhouette have returned following their annual, lengthy migration from South ... this beautiful bird is hard to miss. "They have really long tail ...