Download PDF by George C. West, Carol A. Butler: Do Hummingbirds Hum?: Fascinating Answers to Questions About

By George C. West, Carol A. Butler

ISBN-10: 0813547385

ISBN-13: 9780813547381

Hummingbirds could be the smallest birds on the planet, yet they've got the largest appetites. Their wings flutter on general fifty to 80 occasions every one moment as they stopover at hundreds of thousands of vegetation over the process an afternoon to sip the candy nectar that sustains them. Their hearts beat approximately twelve hundred instances a minute and their speedy respiring permits those awesome birds to maintain their certain demeanour of flight. they could hover within the air for lengthy classes, fly backwards utilizing forceful wings that swivel on the shoulder, and dive at approximately 2 hundred miles in step with hour. local purely to the Americas, a few hummingbirds were recognized emigrate from Mexico to Alaska during a season. observing a hummingbird at a yard feeder, we in simple terms see its glittering iridescent plumage and its lengthy, slender beak; its speedily relocating wings are a blur to our eyes.These tiny, colourful birds have lengthy interested birders, beginner naturalists, and gardeners. yet, do they honestly hum?In Do Hummingbirds Hum? George C. West, who has studied and banded over 13,500 hummingbirds in Arizona, and Carol A. Butler offer an outline of hummingbird biology for the final reader, and extra specified discussions in their morphology and behaviour if you are looking to fly past the fundamentals. Enriched with appealing and infrequent images, together with a piece in shiny colour, this attractive query and resolution consultant bargains readers a variety of information regarding those wonderful pollinators in addition to suggestions for attracting, photographing, and staring at hummingbirds within the wild or in captivity..

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Extra info for Do Hummingbirds Hum?: Fascinating Answers to Questions About Hummingbirds (Animal Q&a Series)

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Plants provide nectar that contains multiple types of sugars, and a sample of seventeen species of flowers in Arizona and California showed that the amount of sucrose in their nectar ranged from 8 to 43 percent. Plants most preferred by hummingbirds have nectar that contains between 20 and 25 percent sucrose—sweeter than a typical cola drink—and they will not drink nectar with less than 12 percent sucrose. When Charles Blem of Virginia Commonwealth University and his colleagues offered Rufous Hummingbirds a choice of sucrose solutions ranging from 10 to 70 percent by increments of 10 percent, the birds most frequently chose the 50 percent solution.

Rebecca Irwin at the University of Vermont tried to learn how hummingbirds know which flowers have the most nectar. She manipulated variables such as flowers with holes made by nectar-robbing bees (which suggest that the nectar supply has been depleted), visual cues (she moved plants around so that spatial memory was not a factor); and translucency, which might reveal the presence of nectar (she painted the corollas of the flowers to eliminate any visual cues). In all her experiments, she found that the hummingbirds still visited significantly more plants with nectar, somehow able to determine its presence.

Question 8: How can hummingbirds be so active? Answer: Hummingbirds have a constant need for oxygen to power their active lives. The larger hummingbirds take in around 180 breaths per minute, and small hummingbirds at rest about 275 breaths per minute. By comparison, humans at rest breathe about sixteen times per minute. When a hummingbird flies with its wings moving from twenty to two hundred beats per second, its respiration rate rises to as many as five hundred breaths per minute, because the contraction of the wing muscles powers its respiratory system.

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Do Hummingbirds Hum?: Fascinating Answers to Questions About Hummingbirds (Animal Q&a Series) by George C. West, Carol A. Butler


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