Fill in the Blanks BirdsOnline version You can review the important information about birds. by Chari P. 1 temperature endothermic regulate Birds are vertebrates . This means they can their own body . 2 flying fly Most birds are adapted to . Some can't , like ostriches . 3 less aerodynamic resistance flight Birds have bodies , which have air . This helps with . 4 legs scales feathers bodies Birds' are covered in , except for the which are covered in . 5 teeth beaks Birds have and don't have . 6 flight hollow lighter They have some bones , which make them and facilitate . 7 anterior wings limbs Their are . 8 air lungs sacs muscles weight They breathe using their . These have to help reduce their and oxygenate the during flight . 9 chew gizzard Birds don't their food . They have a region in their digestive system called the that breaks food up . 10 eyesight hearing Birds have very well - developed and . 11 sing emit communicate Sme birds sounds and " " to with other members of their species . 12 oviparous sexually internal Birds reproduce through fertilisation . All birds are .
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