Some birds winter in one location and summer in another location {migration, bird}, up to 12,000 miles apart. Daylight change affects hypothalamus and pituitary, which affect gonads, which start migration. Increased sex hormones start migration. Migratory birds and homing pigeons use Sun, Moon, Earth magnetic field, air pressure, polarized-light plane, and star-field rotation to establish north-south axis and general directions. They use wind direction, other-bird call notes, and landmarks when close to home.
Biological Sciences>Zoology>Kinds>Bird
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Date Modified: 2022.0224