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There may not be any red-billed queleas in your neighborhood, but that's not because there aren't an abundance of them. These birds, which live in sub-Saharan Africa, are considered agricultural pests because their massive flocks can obliterate entire crops. Although their numbers fluctuate, there are around 1 to 10 billion queleas, which leads scientists to believe that there are more of them than any other bird on Earth, according to Audobon.

The British royal family may be the most famous royal family on the planet, but there are still plenty of other nobles out there. In total, there are 28 royal families who rule over a total of 43 countries around the world, including Japan, Spain, Swaziland, Bhutan, Thailand, Monaco, Sweden, the Netherlands, and Liechtenstein.