_Food._--Nothing seems to be known about the summer food of the orange-crowned warbler, but it probably does not differ greatly from that of the lutescent warbler, whose food has been more thoroughly studied. In winter, it probably eats a fair proportion of berries and other fruits, especially when it spends the winter somewhat farther north than insects are to be found in abundance. It has also been known to come to a feeding station and eat suet, peanut butter, and doughnuts. In summer, it is probably almost wholly insectivorous. I can find no evidence that it does any damage to grapes or other cultivated fruits on its fall migration. _Voice._--Ernest Thompson Seton (1891) says of an orange-crowned warbler that he shot in Manitoba on May 12, 1883: "It was flitting about with great activity among the poplar catkins, and, from time to time, uttering a loud song like '_chip-e chip-e chip-e chip-e chip-e_.' On May 141 shot another Orange-crowned Warbler. Its song is much like that of the Chipping Sparrow, but more musical and in a higher key. The bird is extremely restless and lively, moving about continually among the topmost twigs of the trees and uttering its little ditty about once in every half minute." Dr. Lynds Jones wrote to Dr. Chapman (1907): "The song is full and strong, not very high pitched, and ends abruptly on a rising scale. My note book renders it _chee chee chee chw' chw'_. The first three syllables rapidly uttered, the last two more slowly. One heard late in the season sang more nearly like Mr. Thompson's description: _chip-e, chip-e, chip-e, chip-e, chip-e_, but with the first vowel changed to _e_, thus eliminating what would appear to be a marked similarity to the song of Chippy. Even in this song the ending is retained." Francis H. Allen tells me that this warbler "has a _chip_ note suggesting that of the tree sparrow but sharper." _Field marks._--The orange-crowned warbler is a plain bird, with practically no white markings in wings or tail, clad in dusky olive-green, paler below, the underparts sometimes obscurely streaked with olive-gray. The brownish orange crown patch is usually not conspicuous, except in worn summer plumage, and lacking in young birds and some females. _Fall._--Orange-crowned warblers begin to leave northern Alaska in August. Dr. Nelson (1887) says that it is rare about St. Michael after the middle of the month, his latest date being August 24. The birds obtained at that season were mainly young of the year. "In fall this species frequents the vicinity of dwellings and native villages, where it searches the crevices of the fences and log houses for insects."