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Some male birds and mammals congregate in communal courting grounds called leks.
Lampreys (sometimes also called lamprey eels) are a family of jawless fish
The pancreas. This organ sits just below the stomach and is both an exocrine and an endocrine gland.
Angioplasty. One form is called balloon angioplasty, shown here. A balloon catheter is threaded into
Colon with diverticulosis. An inflamed or infected diverticulum is called diverticulitis.
Five layers or sheaths called koshas in Ayurvedic philosophy.