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Class Aves Presentation
Transcript of Class Aves Presentation
this decides what is in their diet
modified skeleton for flight
the adaption of feathers Four chambered heart
2 separate circulatory groups
1st half takes in oxygen lacking blood, and pumps it to the lungs.
2nd half receives oxygen filled blood, from the lungs, and disperses it throughout the body
Birds have a heart beat rate of 150-1000 beats per minutes, compared to humans who have a heart rate of 60-100 beats her minute. Birds have both Carnivorous and herbivorous diets
2 major digestive organs, Crop and Gizzard
mouth(enter)→esophagus→crop→gizzard→intestine→kidney+ cloaca(exit) Respiratory System Reproductive System Musculoskeletal System Interesting Facts Examples of members of this animal group Nervous System Excretory System
Some mate with various of partners; some species mate for life
Usually only half of the female reproductive system develops
Ovaries: Amniote eggs
eggs are laid in nests
the offspring develops outside the mother (incubation period)
Male types often do not have an external sex organ Some senses are very poor. (e.g. taste and smell)
Birds cerebrum(controls flying, nesting, mating and care for young) is very large.
With reflected pair of optic lobes in brain, there eyesight is excellent and see colors well.
Medulla and spinal cords are much like reptiles.
Birds have a sixth sense (magnetic) that helps them migrate and locate. Bones are very hollow; giving buoyancy and weightlessness.
The hollow parts are connected to the respiratory system
Birds lack teeth
jaws are covered by a hard, horned beak
backbone of 40-60 vertebrae (depending on neck length)
backbone often fused together for support and strength
forelimbs are modified to form wings
adopted to walk on its hind limbs Filter out nitrogenous waste through the kidneys.
Urine travels to cloaca where moisture is absorbed, leaving a white paste (bird droppings)
Ocean birds develop salt glands to filter out salt acting like kidneys, near the eyes. Wrap-up exchanges oxygen and carbon dioxide very quickly
reason for efficiency is due to air sacs in body cavity and bones
air sacs serve buoyancy and as an extra set of lungs
air from posterior air sacs passes into the lungs for gas exchange
Birds are able to remove oxygen from the air when they inhale and exhale All birds are:
Endothermic reptile like animals with an outer covering of feathers.
2 legs used for perching or walking
2 front limbs (wings), usually with useless claws.
Birds have 2-3 layers of feathers Contour feathers
Powder feathers Birds are identified as "hot blooded dinosaurs with feathers" by many paleontologists
One of the first birds on the planet (Archeopteryx) to be discovered dated back to the Jurassic period. The bird had teeth in its beak and toes and claws on its wings.
Lived about 147 million years ago. Image Citations For Example Slide:
http://www.goldridge08.com/anking/Birds.htm What we covered for Class Aves:
General Characteristics & Examples