Biology 18A Crossword
                       
                       
                       
                       
                       
                       
                       
                       
                       
                       
                       
                       
                       
                       
                       
                       
                       
                       
                       
                       
                       
                       
                       
 
 
Down: 2) the white of an egg3) produces digestive juices4) a portion of the digestive tract that temporarily stores food6) a bird that has a long incubation period and is usually able to care for itself when it hatches9) extend from the wings and tail; also contour feathers11) the ridge on a bird's sternum13) the flat part of a feather16) the slender, central part of a bird's feather from which the barb protrudes17) series of hollow chambers connected to the respiratory system of birds Across: 1) the terminal portion of the digestive tract in certain vertabrates that serves as a common passageway for the elimination of urine and feces5) long curved claws found on birds of prey7) any of the outer feathers on a bird; includes the flight feathers8) the male bird's attempt to attract a mate10) young bird that is naked and helpless when hatched12) a thick-walled digestive organ that grinds food14) initial feathers of young birds and underlying, insulating feathers in adult birds15) the song box18) enables birds to live year-round in warm climates where food remains abundant enough to supply their enormous needs19) the shaft portion of a feather that extends below the vane20) the class birds are in
 

 

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