Class Aves

Class Aves - The Birds Class Aves There is some argument...

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Unformatted text preview: The Birds Class Aves There is some argument about this o Some people say that birds should be a subclass under reptiles o Outnumber all of the vertebrates except fishes About 9,800 species of birds Live in very diverse habitats, Forests, deserts, mountains, praries o Exist over all of the oceans of the earth o 4 species at the north pole o South Pole Skua Predatory gull-like bird with a heavy beak Uniqueness of birds o Oilbirds family Steatornithes Live in complete darkness Use the same thing as bats to find their way through caves o Long-tailed Duck Sea duck Can dive 45m Prey on many different types of mussels o Size Smallest: Female Bee Humming Bird Weighs 1.8 g Found in Cuba Largest: Ostrich Weighs 330lbs Very tall o No other vertebrate animal has feathers o Other Features All have forelimbs that have been modified into wings. Doesnt mean that all wings are used for flying, but many use wings for swimming and foraging Hindlimbs are adapted for different types of locomotion All have horny beaks Bony extinction of the skull with a keratinized covering All birds lay eggs Build awesome nest Some can be very delicate and fragile Anatomy focused around flight Wings made to support the bird in the air and provide thrust that propels the bird through the air Bones are light and hallow Respiratory very efficient and highly adaptive Rapid and efficient digestive system o Helps them to process food very quickly Highly developed nervous system o Very acute senses, especially vision o Amazing dexterity in hawks o Can hear about as well as we can o Vision is really good Evolution of Birds o Jurassic Period First Bird fossil was found in where a lake used to be in a lake in Germany called Bolvaria in 1861 The animal that was found is called archaeopteryx lithographica o We know so much about this species because of the limestone that the animal was found in It allowed us to see that the animal had feathers o About the size of an American crow o About 10 specimens that have been discovered o Skull similar to those in modern birds o Has a few differences that ties birds to reptiles Archaeopteryx have thecodont teeth that are usually found in reptiles Embedded in sockets in the jaw bone Long bony tail similar to lizards Pair of feathers per caudal vertebra Clawed fingers Hoatizan are the only birds today with claws and only found in nestlings. Ribs in abdominal areas found in lizards o One of the missing links Intermediate stage between reptiles and birds o Many thought that these were only gliders Alan Feduccia in 1990s pointed out that the shape of the vanes in the feathers are the same as those found in modern birds Had asymmetric primary feathers similar to those that have powered flights o Leading edge is much smaller in width than the trailing edge This one could remain in the air...
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This note was uploaded on 09/19/2011 for the course 1 101 taught by Professor Larrydavid during the Spring '11 term at South Carolina.

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Class Aves - The Birds Class Aves There is some argument...

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