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How long is an African elephant’s tusk?

In both male and female African elephants, tusks grow for most of an elephant’s lifetime, and are an indicator of age. About 1/3 of the tusk’s total length lies hidden inside the skull and are, in fact, elongated incisors. They are around the same length in both sexes, reaching up to 10 ft.–although those of … Continue reading

Q: Why do we kiss? Is kissing on lips a learned behavior or basic instinct?
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Q: Why do we kiss? Is kissing on lips a learned behavior or basic instinct?

Just wondering from a psychological or biological point of view…is kissing something we learn or its something we are born knowing? If it’s something we’re born knowing, why would that be? If it’s something that we teach each other, what is the reason behind it? Continue reading