Hummingbirds live longer than thought
Idaho, Estados Unidos.
The careful placement of small bands named in the legs of these birds in the last decade has enabled researchers to discover that hummingbirds can live more than ten years, compared to two or three years once thought. The marking of birds has identified that perform amazing migrations. A rufous hummingbird captured one winter in Florida appeared the following summer in southeast Alaska, more than 5 000 632 kilometers away. It has been discovered that some of these birds spend the winter in areas with freezing temperatures. "We're learning a lot of hummingbirds placing them bands, which we would not have achieved otherwise," said Bruce Peterjohn, head of the laboratory dial Bird Research Center Wildlife Patuxent, Geological Survey United States, Laurel, Maryland. To capture hummingbirds and affix the bands is necessary to have federal and state permits because they are protected by the Migratory Bird Treaty Act. In the United States, Peterjohn said, there are about 225 specialists to band hummingbirds. Some 125 teachers are considered because they have perfected the technique for years. A hundred additional trained by a specialist underwriters are allowed to catch hummingbirds unsupervised. Despite the obstacles, the number of people engaged in this work has increased compared to ten when he began this activity in mid-1990. At that time Fred Bassett began to mark hummingbirds with bands. "(Hummingbirds) know exactly what happens," said Bassett, 68 bands and teacher placer last summer captured a thousand 900 of these birds in Idaho and spending much of the winter at home in Alabama. "(Hummingbirds) you know that humans placed the feeders. We consider their personal servants," he added. Bassett, who flew fighter jets before retiring in 1988 from the US Air Force, considered amazing flight of hummingbirds. "He begrudge much for their flight, their ability to maneuver. In three meters go from zero to 81 kph," he added. In addition to advances in small bands of metal, underwriters prepared, progress has been made also in the team for traps. Equally important has been the improvement to gather information in order to be more relevant, said Jessica Polloc, research biologist Bird Observatory.