As the most diminutive warm-blooded mammals on Earth, trochilidae , or hummingbirds, have few competitors in terms of speed, with wings that beat an average of 200 times per second. This extraordinary rapidity enables them to perform spectacular feats virtually unknown to any other species of bird, including hovering, flying backwards, and, incredibly, flying upside down. Hummingbirds' metabolisms are also remarkable: the creatures must consume virtually half of their body weight in nectar every day, and even at this rate, ...
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As the most diminutive warm-blooded mammals on Earth, trochilidae , or hummingbirds, have few competitors in terms of speed, with wings that beat an average of 200 times per second. This extraordinary rapidity enables them to perform spectacular feats virtually unknown to any other species of bird, including hovering, flying backwards, and, incredibly, flying upside down. Hummingbirds' metabolisms are also remarkable: the creatures must consume virtually half of their body weight in nectar every day, and even at this rate, the birds continually risk nighttime starvation; a survival mechanism compensates by lowering the body temperature of each at night, and reducing the heartbeat from a diurnal 600 beats per minute to a nocturnal 36. This episode of PBS's Nature series uses special cameras, capable of photographing 500 frames per second, to slow the hummingbirds down and reveal much about the mechanics of their day-to-day behavior -- including not simply nectar gathering, but vicious predatory behavior and mating rituals. Nathan Southern, Rovi
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Seller's Description:
F. Murray Abraham. Very good. 2010 Run time: 73. Providing great media since 1972. All used discs are inspected and guaranteed. Digital copy/codes may be expired or not included. We ship orders daily and Customer Service is our top priority!
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Seller's Description:
F. Murray Abraham. Very good. 2010 Run time: 73. Providing great media since 1972. All used discs are inspected and guaranteed. Digital copy/codes may be expired or not included. We ship orders daily and Customer Service is our top priority!
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Good. May have very light or no surface scratches. Case and cover artwork are included but may show minimal signs of wear. If applicable: Digital copy or ultraviolet codes may be expired or not included. Slipcover may not be included.
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Good. May have very light or no surface scratches. Case and cover artwork are included but may show minimal signs of wear. If applicable: Digital copy or ultraviolet codes may be expired or not included. Slipcover may not be included.
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Good. This item has very light surface scratches that do not affect the use of the disc/s. This is a USED item. Case and cover may or may not have wear or damage. All items unless otherwise noted will include disc, case, and artwork. Codes have been used. Other contents such as booklets may vary, please inquire for details. All items ship Monday-Friday within 2-3 business days.
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Very good. 2014 Run time: 60. Providing great media since 1972. All used discs are inspected and guaranteed. Digital copy/codes may be expired or not included. We ship orders daily and Customer Service is our top priority!
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