Birds Crossword

Besirdes energy, what do bird need a lot of during flight?
Birds are animals that have wings and ________.
Oxygen-rich air fills the ___________of birds when they breathe in and out.
Most birds build nests and _____________their eggs
Birds have a special organ to moisten and store food, called the ______.
What shape of beak is characteristic of a meat-eating bird?
The part of the egg that serves as a food supply for the emybro is the ___
the outer boundary of the egg cell is the _______.
What do birds do to the eggs while they are in the nest, besides incubate them?
Birds have lightweight skeletons because their bones are ______
Bird bones are strong because they have a ________pattern inside.
All birds reproduce by ______
Fertilization in birds is always ______
Birds with short, stiff beaks usually eat _______.