How many birds are in the world? - How many bird species are there?
This question has two answers depending on the intent of your question. However, if you are a scientist, this question may have ±7 answers.
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How many birds are in the world? - How many bird species are there?
What is bird migration? - Why do some birds migrate at night?
Prevent birds from hitting windows - Make windows bird-friendly
Care about birds? Buy a Duck Stamp.
Bad Bird Reviews: American Robin
How to document a rare bird sighting
Do mammals lay eggs? - What is a mammal?
I found a banded bird, now what? - How to report a banded bird
Bad Bird Reviews: Mourning Dove