Alerion is a term for a heraldic bird. Historically, it referred to the regular heraldic eagle. Later, heralds used the term alerion to refer to "baby eagles" or "eaglets". To differentiate them from mature eagles, alerions were shown as an eagle displayed inverted without a beak or claws (disarmed). To differentiate it from a decapitate (headless) eagle, the alerion has a bulb-shaped head with an eye staring towards the dexter of the field. This was later simplified in modern heraldry as an abstract winged oval.