Since 1900, the incidence of fangs among herbivorous mammals has increased 700%. There have been well-documented cases of fangs in cows, goats, yaks, sheep, deer and camels. It has been suggested that environmental pressures have been selecting for herbivores who supplement their diet with small animals. One scientist interviewed on the matter said that the "most frightening thing he had ever seen" was a small island in the Caspian Sea that seems to be the base for a population of carnivorous, and in some cases, cannibalistic goats.