The remora "Remora australis" and occasionally the amphipod "Cyamus balaenopterae" can also be found on fin whales, both feeding on the skin. Infestations of the giant nematode "Crassicauda boopis" can cause inflammation of the renal arteries and potential kidney failure, while the smaller "C. crassicauda" infects the lower urinary tract. Out of 87 whales taken and necropsied from the North Atlantic, infection from "Crassicauda" "boopis" was found to be very prevalent and invasive, indicating high probability that it was responsible for causing death in these whales. "C. boopis" was found in 94% of the whales examined. The worms were usually enveloped by “exuberant tissue reactions which in some whales obstructed multiple renal veins.” The parasite was most likely by environmental contamination, involving shedding of larvae in urine. Major inflammatory lesions in the mesenteric arteries suggested that the worm larvae were ingested and migrated to the kidney.