Toe thus from PIE root "deik" — "to show". In classical Latin "hallex", "allex", "hallus" and "allus", with genitive "(h)allicis" and "(h)alli", are used to refer to the big toe. The form "hallux" (genitive, "hallucis") currently in use is however a blend word of the aforementioned forms. Compare pollex, the equivalent term for the thumb. In birds with anisodactyl or heterodactyl feet, the hallux is opposed or directed backwards and allows for grasping and perching. While the thumb is often mentioned as one of the signature characteristics in humans, this manual digit remains partially primitive and is actually present in all
Names for the human species "Gaian") is frequently used, as it were naming humanity by its planet of origin. Incidentally, this situation parallels the naming motive of ancient terms for humanity, including "human" ("homo", "humanus") itself, derived from a word for "earth" to contrast humans as earth-bound with celestial beings (i.e. deities) in mythology. Names for the human species The common name of the human species in English is historically "man" (from Germanic), often replaced by the Latinate "human" (since the 16th century). In addition to the generally accepted taxonomic name "Homo sapiens" (Latin: "sapient man", Linnaeus 1758), other Latin-based names for the human species