How do birds know when to fly back north?
Most species are born with migration routes genetically encoded in their brains. The timing of their return, too, is governed by an internal clock that tracks the changing ratio of daylight to darkness as winter progresses, and longer days trigger their instinct to head north.
How birds find their way home?
Why do birds fly east in the morning?
Many species of birds that normally migrate during the night have been observed engaging in so-called morning flights during the early morning. The results of previous studies have supported the hypothesis that one function of morning flights is to compensate for wind drift that birds experienced during the night.
How do birds fly through trees?
Their bodies and wingspans rarely are as large as spaces between branches, much less trees. They simply move betwen these obstacles with ease, rarely colliding with objects. Their challenge lies in being able to see objects that need to be avoided.
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