Betula alnoides that, by time it matures, reaches a diameter of by . The peduncle is long while the diameter of the bracts is only . The seeds are ripe from March to May and are long while the flowers bloom from October to January. "Betula alnoides" inner bark is edible and is used for making cakes and bread. It is also considered to be an antidote against snakebites and is used to treat dislocated bones. Betula alnoides Betula alnoides (; , , literally: "tiger power") is a species of birch that can be found in natural condition in such countries as
Northern rough-winged swallow Northern rough-winged swallow The northern rough-winged swallow ("Stelgidopteryx serripennis") is a small, migratory swallow. It is very similar to the southern rough-winged swallow, "Stelgidopteryx ruficollis". The genus name, "Stelgidopteryx", is from Ancient Greek and means "scraper wing" and the species name, "serripennis", is derived from Latin and means "saw feather". In the common name, "rough-winged" refers to the serrated edge feathers on the wing of this bird; this feature would only be apparent when holding this bird. Six subspecies of the northern rough-winged swallow are currently recognized. It has been proposed that another race be recognized, "aphracta", but this is