The Great Horned Owl, (_Bubo virginianus_).--These nocturnal birds of prey inhabit heavily wooded regions, feeding on mice, and poultry when it is obtainable. The bright yellow iris, the conspicuous feather horns, and the apparently pivoted neck are curious features of these birds. Their reputation for wisdom is founded only on their external appearance, for in reality they are rather dull birds.
The Snowy Owl, (_Nyctea nyctea_), of the Arctic regions, migrating in winter to the northern United States, sometimes remains for several seasons in succession so far north that no specimens are obtainable. During 1899, 1900, and the first half of 1901, not one specimen could be procured, but in the late autumn of 1901 a southward migration began. On June 1, 1911, the Park exhibited six fine specimens, one of which was almost pure white. During the three hottest months of summer, these birds would suffer considerably, so during this period they are confined in a cool, dark cellar, thus keeping in perfect health and comfort throughout the year.
The Screech Owl, (_Otus asio_).--This little horned owl is our commonest species, and frequents the neighborhood of dwellings and orchards. Being nocturnal it is more common than is generally supposed, and its curious cry, which is not a screech, but a musical, quavering series of notes, is the cause most frequently leading to its discovery. Its two phases of plumage, red and gray, occur independently of sex, age or season. Its food consists of mice and insects.
The Barred Owl, (_Syrnium varium_).--This owl is more diurnal than its nearest relatives, and often hunts its prey in bright moonshine. Its deep, penetrating call, "woo-o-o, whoo-o-o," is one of the most weird and striking cries of the bird world. Another peculiarity, common to all owls, but more noticeable in this less nocturnal species, is the absolutely noiseless flight. The soft, downy feathers of the owl permit it to wing its way through the air with as little noise as a falling leaf.
The Eagle and Vulture Aviary stands in an open glade, but well surrounded by forest trees, in Bird Valley, between the Aquatic Bird House and the new Zebra House. It is a commodious and pleasant installation, well adapted to exhibit the Society's collection of rapacious birds. Its length over all is 210 feet. It has seven very large flight cages and six smaller ones. The largest cages are 24 feet wide, 33 feet deep and 31 feet high. In the rear of the great wire structure will stand a very comfortable brick building to serve as a winter shelter for the tropical birds of the collection; but it will not be open to the public.