The Pine Grosbeak is a retiring bird and would seem to be somewhat shy as it does not frequent the roadside or inhabited places except when forced to do so by the lack of food. This, however, is not the case, for in the forests where it makes its home it is not difficult to approach it. It will frequently alight and begin feeding within a few feet of an observer.

The song of the European form of this species is said to be "exceedingly agreeable, varied, melodious, sonorous sometimes strong, sometimes soft." It is also a mocker and to a limited extent will imitate the voices of other birds. Dr. Coues likens its song to that of the purple finch and says that during the late summer and winter it is "clear, sweet and flowing." Its call note is single, sweet and plaintive not unlike that of the well known bullfinch.

Pine seeds seem to form the principal food of the Pine Grosbeak though it also feeds extensively on those of the birch, alder and related trees. At times it will descend to the ground and gather the seeds of herbaceous plants and may eat a few insects. Dr. Dall writing of the Pine Grosbeak as he found it in Alaska, says: "I have opened the crops of a great many and always found them filled with what I for a long time supposed to be spruce buds, but on closer examination I found that they were the hearts of the poplar buds, with the scales and other external coverings carefully rejected.

I have never found anything else in their crops." In those regions where the mountain ash abounds the berries of this beautiful tree form a very important part of their diet whenever it frequents such a district.
The outer wall of the home of this denizen of the forest is constructed of a framework of slender fir or pine twigs. Inside of this wall and projecting above it is placed a lining of fine roots and grass woven with a fine hairlike lichen.

The Pine Grosbeak seems to bear confinement, but when caged it is said that after the first moulting the crimson color of the plumage is replaced by a bright yellow. Mr. E. W. Nelson observed these birds in Alaska and says, "During winter, while traveling along the frozen surfaces of the water courses of the interior it is common to note a party of these birds busy among the cottonwood tops, uttering their cheerful lisping notes as they move from tree to tree. I have frequently passed a pleasant half hour on the wintry banks of the Yukon, making a midday halt and waiting for the natives to melt the snow for our tea, listening to the chirping and fluttering of these birds as they came trooping along the edges of the snow-laden woods in small parties. They rarely paid any attention to us, but kept on their way and were, ere long, lost to sight in the midst of the bending tree tops and silence again pervaded the dim vistas of the low woods. Beyond the faint, soft call note uttered as the birds trooped along through the forests, I never heard them make any sound."