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The African Clawed Frog and Early Pregnancy Tests

animals.howstuffworks.com/amphibians/african-clawed-frog.htm

Meet the African clawed frog, a fully aquatic amphibian that's part living fossil, part lab legend, and part ecological wildcard.

4 Smartest Birds Prove That 'Bird Brain' Shouldn't Be an Insult

animals.howstuffworks.com/birds/smartest-birds.htm

Birds are more than chirps and feathers. Some of the smartest birds rival primates when it comes to solving problems and navigating complex environments.

Do Female Cats Spray? Yes, Urine Marking Crosses Sexes

animals.howstuffworks.com/pets/do-female-cats-spray.htm

If you've ever come home to find a small, smelly surprise on your wall, you might be wondering, do female cats spray?

White Spotted Jellyfish: Cute Until They Become Invasive

animals.howstuffworks.com/marine-life/white-spotted-jellyfish.htm

You’ve probably seen them in aquarium tanks or floating just offshore—those milky, gelatinous blobs with polka dots and long, frilly arms. Meet the white spotted jellyfish (Phyllorhiza punctata), a tropical jellyfish invader that's turning up far from home.

What Country Has the Most Tornadoes in the Entire World?

science.howstuffworks.com/nature/natural-disasters/what-country-has-the-most-tornadoes.htm

If you have ever wondered which country has the most tornadoes, the answer is the United States. No other country on Earth experiences as many tornadoes per year. Meteorologists estimate the entire USA averages more than 1,000 tornado reports annually.

Eye Color: Percentage of the World Population With Each Shade

science.howstuffworks.com/life/genetic/eye-color-percentage.htm

Understanding eye color percentage reveals how human genetics shapes the colors we see in the iris. The iris is the colored part of the eye, and its appearance depends largely on how much melanin pigment it contains.

Which Countries Allow Dual Citizenship?

people.howstuffworks.com/which-countries-allow-dual-citizenship.htm

If you have ever wondered which countries allow dual citizenship, the answer includes many nations across Europe, the Americas and other regions. Dual citizenship—sometimes called dual nationality or multiple citizenship—means a person legally belongs to more than one country at the same time.

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