Small oval or kidney-shaped organs which are part of the lymphatic and the immune systems. Their function is to filter the lymph for pathogens and to present these to cells of the immune system (white blood cells or leukocytes) that are present within the node. Lymph nodes are commonly found below the jaw, within the trunk, or near joints (e.g. in the axillary region). Swollen lymph nodes can be indicative of diseases (e.g. bacterial infections, or even cancer) and they can get infected themselves (notably Strangles, caused by infection through Streptococcus equi equi bacteria).