Similar studies in the United States reveal that a Laysan albatross made four treks from Tern Island, northwest of Honolulu, to the Aleutian Islands ​ — a 4,000 - mile [6,000 km] round - trip — ​ to bring home food for its single chick.
पिलांची काळजी घेणाऱ्‍या काही पक्ष्यांमध्ये नरांची संख्या माद्यांपेक्षा दुप्पट आहे.