The nest of the Chickadee is usually a warm and soft felted mass of the hair and fur of the smaller quadrupeds, downy feathers, fine dry grasses and mosses, lining the cavity in which it is placed and contracting it into a deep and purse-like opening if the cavity be larger than is necessary. Usually the site selected is already in existence, and only enlarged or altered to suit the wishes of the pair. But not unfrequently, at some pains, they will excavate an opening for themselves, not only in decaying wood, but even into limbs or trunks that are entirely sound. These birds in winter collect around the camps of the log-cutters, become very tame, and seek on all occasions to share with their occupants their food, often soliciting their portion with plaintive tones. Though nearly omnivorous in the matter of food, they prefer insects to everything else, and the amount of good conferred by them on the farmers and the owners of woodlands in the destruction of insects in all their forms—egg, caterpillar, larva, or imago—must be very great. No chrysalis is too large to resist their penetrating bill, and no eggs so well hidden that they cannot find them out. I have known one to attack and fly off with the chrysalis of a “Woolly-bear” or salt-marsh caterpillar (_Leucarctia acræa_). When thus foraging for their food they seem totally unconscious of the near presence of man, and unmindful of what is passing around them, so intent are they upon the object of their pursuit. The notes of the Chickadee exhibit a great variety of sounds and combinations. As they roam through the country in small flocks in quest of food, their refrain is a continued and lively succession of varying notes sounding like a quaint chant. When annoyed by any intrusion, their cry is louder and harsher. They are rarely thus disturbed by the presence of man, and even when their nest is approached by him they present only a passive and silent resistance. Not so when a cat or a squirrel is observed in unwelcome vicinity. These are pursued with great and noisy pertinacity and hoarse cries of _dāy, dāy, dāy_, in which they are often joined by others of the same species. So far as we have observed them, they are apparently affectionate, gentle, and loving to each other. We utterly discredit the accusation that they will treacherously beat out the brains of feeble birds of their own race. It is unsupported by testimony, and in the instance cited by Wilson he gives no evidence that this injury may not have been done by some other species, and not by one of its own kindred. Their nest is usually near the ground, and the number of eggs rarely if ever exceeds eight. They are said to have two broods in the season, but this statement seems to be contradicted by their continued presence after June in small flocks, evidently the parents and their first and only brood, who apparently remain together nine or ten months.