This Spanish Easy Review quiz will test your vocabulary on birds. Do you like to bird watch? If you ever take the time to really study these little creatures you will find that they are quite amazingly entertaining! Some people have made bird watching a lifelong hobby. Whether you are into that or not, it is still fun to learn what each different type of bird is. In fact, did you know that there are close to 21,000 different species of birds in the world? No one knows the exact number because almost every year a new type of bird is found.