For clinical data see section “Risk” below
Certain species of whales (Cetacea) and seals (Phocidae), as well as polar bears (Thalarctos maritimus) and walruses (Odobenus rosmarus) have been associated with poisoning.
Mammals that can cause poisoning contain toxins primarily in the liver, but also sometimes in other organs and in muscle tissue. These animals generally live in cold and polar zones. Large amounts of vitamin A have been detected in the liver of polar bears and the Bearded seal Erignathus barbatus, which, when consumed, can lead to hypervitaminosis A.
Poisoning is very rare.
Halstead 1988, 2001b