Betula pendula scales. The foliage is a pale to medium green and turns yellow early in the autumn before the leaves fall. In mid-summer, the female catkins mature and the male catkins expand and release pollen, and wind pollination takes place. The small 1 to 2 mm winged seeds ripen in late summer on pendulous, cylindrical catkins long and broad. The seeds are very numerous and are separated by scales, and when ripe, the whole catkin disintegrates and the seeds are spread widely by the wind. Silver birch can easily be confused with the similar downy birch ("Betula pubescens"). Yet, downy birch
White-winged vampire bat White-winged vampire bat The white-winged vampire bat ("Diaemus youngi"), a species of vampire bat, is the only member of the genus Diaemus. They are found from Mexico to northern Argentina and are present on the islands of Trinidad and Margarita. The white-winged vampire bat was described by Dutch zoologist Fredericus Anna Jentink in 1893. Dr. Charles Grove Young (1849-1934) is the eponym for the species name "youngi". Jentink decided to honor Young with the species name because "our Museum is indebted [to him] for so many additions to its collections of the British Guyana animals." When it was described by