Arctic Tern

lunedì 3 ottobre 2011 06:29 Pubblicato da Progetto Foligno
The arctic tern is a relatively small bird. It is also one of the most determined. Even though it is small it is still able to accomplish the remarkable feat of migrating over 22,000 miles (35,000 km) each year. The distance that it migrates is the longest of any bird. This mileage would be accurate if it flew in a straight line to where it was migrating to and from. But since it takes a lot of excursions the distance it flies each year is even greater. In fact the arctic tern almost never lands and is known to be in daylight more than dark because of its migration schedule.

The Arctic tern is about 12 to 15 inches (30-38 cm) long and weighs about 2.8-4 ounces (80-110 grams). Males and females are similar. The Arctic tern has webbed feet, the tail is long and forked, the legs are short and red, and the head is rounded and white with a black cap.

These social birds live in large groups, called colonies. Immediately before beginning a migration, a noisy colony of birds suddenly becomes quiet, and they all take to the air and fly away (this behavior is called “dread”). Arctic terns have a life span of about 20 years.

Research has shown that arctic terns will do everything possible totern photo courtesy Krog’s Kamp stay out of the water. Terns don’t swim well even though their feet are webbed because they have small feet so they swoop down, catch the fish, and keep flying to stay out of the water.

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