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Sean Nguyen's Biology Crossword Puzzle

Across
capable of injecting poison by means of a bite or sting
the clear part of the egg, which also supplies food and water for the embryo
the scientific study of birds
a fibrous protein forming the main structural constituent of hair, feathers, hoofs, claws, horns, etc
fluid-filled membrane that surrounds the developing embryo
bird feathers used for flight
an object on which a bird alights, such as a branch
a structure or place made or chosen by a bird for laying eggs and sheltering its young
the process of shedding old feathers, skin, or shell, to make way for new growth
active at night
the main food supply for the embryo in the egg
Down
an unborn or unhatched offspring in the process of development
bird feathers used for insulation
The tusk or tooth of an animal, by which the prey is seized, injected with poison, or held and torn
the jaws of a bird
seasonal movement of animals from one region to another
process of keeping eggs warm outside the body
the process of a young bird, fish, or reptile emerging from its egg
a short, high-pitched sound, such as the one a small bird or insect makes
a place where birds regularly settle or congregate to rest at night