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Birds - PowerPoint PPT Presentation


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Aves. Read 632-642 Hw 644 #1-21 Work on NR 5. Reminder. Aves are in the phylum Chordata (vertebrata) Aves is a CLASS. Aves. Examples: Gulls, penguins, albatross, parrots, doves, etc Are warm-blooded (endotherm/homeotherm) winged Lay eggs Bipedal (walks on 2 legs). Characteristics.

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PowerPoint Slideshow about 'Birds' - Michelle


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slide1

Aves

Read 632-642

Hw 644 #1-21

Work on NR 5

reminder
Reminder
  • Aves are in the phylum Chordata (vertebrata)
  • Aves is a CLASS
slide3
Aves
  • Examples:
    • Gulls, penguins, albatross, parrots, doves, etc
  • Are warm-blooded (endotherm/homeotherm)
  • winged
  • Lay eggs
  • Bipedal (walks on 2 legs)
characteristics
Characteristics
  • 4 chambered heart
  • Contain unique digestive and respiratory systems adapted for flight.
  • Excretion is done using a cloaca
  • Brain is highly specialized and some are considered extremely intelligent
  • Lightweight skeleton
  • Toothless beak
  • Hard shelled eggs
  • feathers
reproduction
Reproduction
  • Sexual
    • All lay eggs
    • Internal fertilization using cloaca
    • Males are ZZ and females are ZW (a system where the ovum determines sex, not the sperm)
    • Typically monogamous & perform biparental care
    • Yolk of a bird egg is larger than a reptile egg
unique traits
Unique traits
  • Hollow bones
  • Crop and gizzard for grinding of food due to lack of teeth
  • High metabolism to aid flight energy
  • 75% of air intake bypasses the lungs and are then used during exhalation
  • Most have poor sense of smell
  • Highly complex mating rituals
  • Non-Darwinian selection
crop gizzard
Crop & Gizzard
  • Also found in insects.
    • Why in birds and insects but not other animals?
      • Lack of teeth reduces ability to mechanically break down food.
hollow bones
Hollow bones
  • Bones are as strong and can make up as little as 5% of the total body weight of a bird.
    • Human skeleton makes up about 14% of our total weight.
historical birds
Historical birds
  • Earliest “bird” is Archaeopteryx
  • Some extinct species include:
    • Dodo
    • Moa
    • Terror birds
major orders
Major Orders
  • Evolutionary Milestone: feathers
  • Within class Aves are many (~27) orders:
    • Some examples are:
      • Falconiformes
      • Passeriformes
      • Casuariiformes
      • Podicipediformes
      • Piciformes
      • Ciconiiformes
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