It is a psychic type Pokémon. The appearance of Espeon is said to resemble the Japanese mythological creature known as Nekomata which also displays the feline body with forked tail tip and solid colored eyes. An Espeon's fur is so sensitive it is used to sense air currents, allowing it to predict the weather, as well as the actions of its opponent in battle. Its forked tail quivers when this occurs. A red jewel rests on its head and glows whenever Espeon uses its psychic abilities.
Source from Wikipeida