Animals

Hippos have been known to historians since ancient times.

Skin

Unlike eared seals, seals do not bark for communication purposes.

While hunting, it might have use its tail to harm or stun its prey.

Spanish, Dutch and English traders took guinea pigs to Europe, where they quickly became popular as exotic pets among the upper classes and royal families, including Queen Elizabeth I.

They are mainly solitary animals.

Despite their empathetic nature, dolphins sometimes fight among themselves.

There are 17 species worldwide.

They are very social, probably this helps them avoid predation.

Although it is listed as a near-threatened species, it is protected by state laws in the U.S.