There are three authors presently writing adult books about birds with the knowledge of naturalists and the sensitivity of novelists. In descending order of achievement they are: Franklin Russell, Allan Eckert and Robert Murphy. In 1964, Mr. Russell's Argen the Gull was an adult book which didn't get the attention it deserved. He has used the same approach to his subject in Hawk in the Sky. He follows the life cycle of a red-tailed hawk from its birth to its adult life, detailing the feeding, the flight training and the gradual command of a delicate, deadly power in beaks and wings. The strict round of instinctual schedules demanded by nature are described, shown really without sentimentality.