Humans are mammals, the most successful taxonomic class of organisms to colonise the Earth. The word mammal derives from the Latin meaning of breast, "mamma", where breasts are a consistent trait among mammals in mothers feeding for feeding their young. Coincidentally, the more scientific name for the breast is the mammary gland, which further illustrates the point.
The word "animal" comes from the Latin word animal, of which animalia is the plural, and is derived from anima, meaning vital breath or soul. In everyday colloquial usage, the word usually refers to non-human animals. The biological definition of the word refers to all members of the Kingdom Animalia. Therefore, when the word "animal" is used in a biological context, humans are included.
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