In international travel, especially by fast means of transportation such as by jet planes, people often travel from one place to another with big difference in their time zones within short span of few hours. This does not allow the biological clock of the person to adjust to the new time zone. As a result the body function are out of their normal rhythms, and efficiency falls, and people feel tired. This effect effect of travelling across different time zones in a short time is called jet-lag.
Migrating bird don't experience jet lag, has nothing to do with their being birds rather than humans. Birds do not experience jet lag because they do not fly as fast as the planes that carry people. This birds do not need to adjust with the time zones that fast.
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