EXCRETORY SYSTEM. There is no urinary bladder.
DIGESTIVE SYSTEM. Birds eat high energy foods--there are almost no strictly vegetarian birds. They have efficient digestive enzymes.
Cedar Waxwing
09 December 2009
Adaptations for Flight 5
Muscles. Pectoral muscles = 15-40 % of bird's weight (vs. 1-2 % in people). Another difference is that the muscle that pulls the wing back (= supercoracoidius) is attached to the sternum rather than the backbone (= better balance for flying). There are no heavy jaw and facial muscles and no heavy back muscles.
EXCRETORY SYSTEM. There is no urinary bladder.
DIGESTIVE SYSTEM. Birds eat high energy foods--there are almost no strictly vegetarian birds. They have efficient digestive enzymes.
EXCRETORY SYSTEM. There is no urinary bladder.
DIGESTIVE SYSTEM. Birds eat high energy foods--there are almost no strictly vegetarian birds. They have efficient digestive enzymes.
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