What is extinct?

This word is what birds become when there aren't anymore of them left.

What is the hummingbird?

The smallest bird in the world is one of these.

What are collecting, touching, or disturbing birds or their nests?

If you are out hiking and come upon a bird's nest, this is something you shouldn't do.

What is the bill or beak?

This is another word for the mouth of a bird.

What are binoculars?

Bird watchers use these to bring birds into clearer view.

What is the Passenger Pigeon?

Only 100 years ago, thousands of these birds could be seen in the skies. Overhunting quickly drove them to extinction.

What is the Ostrich?

The largest egg in the world comes from this bird.

What are windows?

Birds often fly into these "invisible" structures, found everywhere from skyscrapers to your house.

What are talons?

The claws of a bird of prey are called this.

What is migration?

The seasonal movement of birds from one place to another is called this.

What is the DoDo?

Because it had never seen humans and therefore had no fear of them, this large flightless pigeon is now extinct.

What is a Perigrine Falcon?

One of the fastest birds in the world is this one.

What are pesticides?

Use of these chemicals has led to declines in the populations of many bird species.

What is molting?

When birds lose old feathers and grow new ones it is called this.

What are field guides?

These books are often used to help identify birds.

What is habitat loss?

This is one of the major causes of extinction in the world.

What are beak and feathers?

This part of a bird is made up of the same material as our fingernails and hair.

What are cats?

These domestic predators kill hundreds of millions of birds each year.

What is a cavity?

The name of this type of nest made by woodpeckers, is also what a hole in your tooth is called.

What is to find food?

In order to avoid competition, this is the reason birds migrate.

What is the Bald Eagle?

This bird, the U.S. symbol, was almost driven to extinction by the use of a pesticide called DDT.

What are Ravens?

Associated with the quote "Nevermore," these black birds may be among the most intelligent.

What is the Endangered Species Act?

This Act is designed to help species of wildlife whose populations are in trouble.

What is plummage?

This is another word for the feathers of a bird.

What is habitat?

This is made up of food, water, shelter, and space.