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In this respect they differ again from the woodpeckers, which have either two fore and two hind toes, or two in front and only one behind. This will appear all the more remarkable when it is remembered that the Picidae do not descend head downward at all, while the Sittinae are the head-downward goers par excellence. Yet they have only one rear toe to support them in their inverted position.
In migrating northward, the males have abandoned their nests, or rather chambers, which they do after the first season, their cousins, the nuthatches, chickadees, and brown creepers, fall heir to them. These birds, especially the creepers and nuthatches, have many of the habits of the Picidae, but lack their powers of bill, and so are unable to excavate a nest for themselves.
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