Yes the Wild Birds Know it is Winter

Wild Birds are prepping for winter, this does not include shopping for bread and eggs… Now is a good time to keep your feeders full of high oil content food such as sunflower seeds, peanuts, nutra safflower, tree nuts and add a wee bit of millet to the mix. During the deep winter or even now (early winter blast) birds can burn almost half of their calorie intake just to find food and to keep themselves warm during the long cold dark nights.
One of the best ways to help the birds during a hard winter is to offer them a source of water. Wild Birds need to keep themselves clean year round but in the winter a good clean plumage offers great insulation from the cold and assists in agile flight.
A bird bath heater works wonders and is one of the best ways to win your feathered friends company. OBWild Birds,Wild Birds

A songbird is a bird belonging to the clade Passeri of the perching birds (Passeriformes). Another name that is sometimes seen as a scientific or vernacular name is Oscines, from Latin oscen, “a songbird”. This group contains some 4,000 species found all over the world, in which the vocal organ typically is developed in such a way as to produce a diverse and elaborate bird song.

Songbirds form one of the two major lineages of extant perching birds, the other being the Tyranni which are most diverse in theNeotropics and absent from many parts of the world. These have a simpler syrinx musculature, and while their vocalizations are often just as complex and striking as those of songbirds, they are altogether more mechanical sounding. There is a third perching bird lineage, theAcanthisitti from New Zealand, of which only two species remain alive today.[1]

There is evidence to suggest that songbirds evolved 50 million years ago in the part of Gondwana that later became Australia, New Zealand, New Guinea and Antarctica, before spreading around the world.[2]