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.
Internal hemorrhoids can also cause similar symptoms. But when internal hemorrhoidal veins in the anal canal rupture, the result is bright red blood that accompanies a bowel movement. Rectal bleeding is the most common symptom of ruptured hemorrhoids. In most cases, bleeding hemorrhoids are not a serious problem.