brown tree snakes are nocturnal. most of Guam's native forest birds are not. explain how this has affected both the snakes and the birds. The snakes easily find and kill the sleeping birds, and the snakes success has allowed them to reproduce quickly.
A person may have both internal and external hemorrhoids. Symptoms of hemorrhoids include occasional throbbing pain, itching, burning sensation, bright red blood on toilet paper or stool, or a lump of soft tissue protruding outside of the anus.
Most often, internal hemorrhoids have no symptoms but are only found if there is bleeding with a bowel movement or if the hemorrhoid prolapses so that it can be felt outside of the anus. This may lead to itching and pain as well as the bleeding. Prolapse of an internal hemorrhoid occurs when the internal hemorrhoids swell and extend from their location in the rectum through the anus. A prolapsed internal hemorrhoid: Can be felt as a lump outside the anus.