Mr.Maack enumerates thirty-nine species that dwell here the entire year.

They include eagles, hawks, jays, magpies, crows, grouse, owls, woodpeckers, and some others.

The birds of passage generally arrive at the end of April or during May, and leave in September or October.
It is a curious fact that they come later to Nicolayevsk than to the town of Yakutsk, nine degrees further north.

This is due to differences of climate and the configuration of the country.

The lower Amoor is remarkable for its large quantities of snow, and at Nicolayevsk it remains on the ground till the end of May.