The first definite evidence that the young were attempting to feed themselves was obtained when they were 23 days old. Frequently thereafter, fresh blood was found on their beaks and claws, but as late as the 34th day a parent was seen feeding them. That day, after being flushed, a parent returned to the nest at 7 p. m., and began tearing away parts of a cottontail which had previously been brought to the nest. Bones in the hind leg of the rabbit broke readily under pressure of the parent's bill, and the three young crowded in close, opening their bills widely and placing them around that of the parent. Of cottontails, the only parts consistently uneaten were the upper cheek teeth and the supporting maxillae and connecting palatal bridge. FOOD BROUGHT TO THE NEST In the 45 days that the young remained at the nest site in 1945, ninety-one individuals of 16 different species of animals were brought by the parent owls (table 2). Probably a few smaller animals, of which we saw no traces, were caught and eaten at night. In 1946, two additional kinds of birds were brought to the nest: 1 Baldpate (_Mareca americana_) and 1 Pied-billed Grebe (_Podilymbus podiceps_). The large number of Rock Doves in the list can be explained by their abundance on the buildings on the University campus, including the Museum building where some were nesting as close as 100 feet to the owl nest. When the owls were less than a week old, only small birds and mammals were brought (young Rock Doves, Robins, Starlings, Grasshopper Sparrow, meadow mouse, and Norway rat). The first rabbit was brought when the owls were eight days old. TABLE 2. Number of food items brought to the nest by the Great Horned Owls in 1945 Birds Rock Dove (_Columba livia_) 32 Robin (_Turdus migratorius_) 6 Starling (_Sturnus vulgaris_) 4 Mourning Dove (_Zenaidura macroura_) 10 Meadowlark (_Sturnella sp._) 3 Red-wing (_Agelaius phoeniceus_) 1 Bronzed Grackle (_Quiscalus versicolor_) 1 Mockingbird (_Mimus polyglottos_) 1 Brown Thrasher (_Toxostoma rufum_) 1 Grasshopper Sparrow (_Ammodramus savannarum_) 1 Coot (_Fulica americana_) 3 Sora (_Porzana carolina_) 1 Blue-winged Teal (_Anas discors_) 1 Mammals _Sylvilagus floridanus_ 19 _Rattus norvegicus_ 6 _Microtus ochrogaster_ 1