Animals can also be frightened to death, as was demonstrated in the 1950s and 1960s in which experiments on animals were undertaken to determine whether this was possible.
Although such death has been considered restricted to superstitious primitive societies, it is now held to be possible that it might be to some degree responsible for deaths by heart attack. The more common types of heart attack can also be triggered by fear. If this only applied to a small percentage of the millions of deaths by heart attack, it would still be a significant public health threat.