Glossy buckthorn has gray-brown bark and lightly colored lenticels which give the bark a speckled appearance. Leaves of glossy buckthorn are 1-3 inches long and shiny on the upper surface, oval shaped and slightly wavy. Flowers are 5-petaled, greenishwhite and the fruits are red, turning almost black when ripe. The birds love them which only makes it easier for this very aggressive non-native to spread. I do not know what kind of insect is sitting on the branch, but I thought I would include him anyway.