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Lecture 6 ANIMAL EVOLUTION: THE VERTEBRATES

Lecture 6 ANIMAL EVOLUTION: THE VERTEBRATES. Birds. Most show parenting behaviour-nest guarding. Flight involves; bones with a lightweight, honeycombed structure & efficient modes of respiration & circulation.

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Lecture 6 ANIMAL EVOLUTION: THE VERTEBRATES

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  1. Lecture 6ANIMAL EVOLUTION: THE VERTEBRATES

  2. Birds • Most show parenting behaviour-nest guarding. • Flight involves; • bones with a lightweight, honeycombed structure & efficient modes of respiration & circulation. • High rates of metabolism to sustain flight and to keep body warm even when the surrounding temperature declines; depends on the flow of oxygen. • Lungs connect to elastic ventilating sacs that greatly enhance oxygen uptake.

  3. Birds • Birds have a large, durable, 4chambered heart. • Closely regulate their body temperature. • Heart pumps oxygen-enriched blood to the lungs and to the rest of the body. • Wing is modified structure of ancestral forelimb. • Tend to migrate; recurring pattern of movement from one region to another in response to environmental rhythms. • Seasonal change in daylength – influences the internal timing mechanism.

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