Avian Morphology I

5 Questions

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Morphology Quizzes & Trivia

Questions and Answers
  • 1. 
    Feathers were once the only trait needed to classify an animal into Aves. Feathers are arranged in A)__________, that are separated by B)__________
    • A. 

      A) = apteria, b) = pterylae

    • B. 

      A) = apteria, b) = calamus

    • C. 

      A) = pterylae, b) = calamus

    • D. 

      A) = calamus, b) = apteria

    • E. 

      A) = pterylae, b) = apteria

  • 2. 
    Feather types include (choose all that apply)
    • A. 

      Bristles.

    • B. 

      Contour feathers, including body and flight feathers.

    • C. 

      Down.

    • D. 

      Filoplumes.

    • E. 

      Semiplumes.

  • 3. 
    Passerines can have between 1,000 and 5,000 feathers (tui and fantail are passerines), and a bigger bird like a bald eagle may have 7200 feathers. The contour feathers of a bald eagle can weigh more than the skeleton.
    • A. 

      True

    • B. 

      False

  • 4. 
    The bird wing can act as an aerofoil and provide lift according to Bernoulli’s principle. The alula is critical to lift generation because it
    • A. 

      Helps to maintain turbulent airflow across the dorsal surface of the wing.

    • B. 

      Helps to maintain laminar airflow across the ventral surface of the wing.

    • C. 

      Helps to maintain turbulent airflow across the ventral surface of the wing.

    • D. 

      Helps to maintain laminar airflow across the dorsal surface of the wing.

    • E. 

      All of the above.

  • 5. 
    The digestive tract of the hoatzin (Opisthicoformes, Opisthocomus hoazin) is unique among living dinosaurs because it has
    • A. 

      A small intestine that is three metres long.

    • B. 

      A muscular crop with ridges.

    • C. 

      No gizzard.

    • D. 

      Two proventriculi.

    • E. 

      A smooth-muscle appendix.