The black squirrel, Weld says, is also peculiar to North America. It is entirely of a shining black, except that the muzzle and the tail are sometimes white; specimens have sometimes been seen with a white ring round the neck. "In this year" (1796), Weld says, "the black squirrels migrated from the south, from the territory of the United States. As if conscious of their inability to cross a very wide piece of water, they bent their course toward Niagara River, above the falls, and at its narrowest and most tranquil part, crossed over into the British territory. It was calculated that upward of 50,000 of them crossed the river in the course of two or three days, and such great depredations did they commit on arriving at the opposite side, that in one part of the country the farmers deemed themselves very fortunate where they got in as much as one third of their crops of corn. Some writers have asserted that these animals can not swim, but that when they come to a river, in migrating, each one provides itself with a piece of wood or bark, upon which, when a favorable wind offers, they embark, spread their bushy tails to catch the wind, and are thus wafted over to the opposite side. Whether these animals do or do not sometimes cross in this manner, I can not take upon me to say; but I can safely affirm that they do not always cross so, for I have often shot them in the water while swimming. Their tail is useful to them by way of rudder, and they use it with great dexterity; owing to its being so light and bushy, the greater part of it floats upon the water, and thus helps to support the animal."--P. 330.