Hot iron branding has caused terrible pain to animals, both wild and domestic. Photographs of branded elephant seals, with hot iron brand marks covering a significant part of the animals' sides (both sides so scientists can read the number easily) were published in the Sydney, Australia Mercury.
According to the March 29th Mercury, "The evidence collected shows the brands have created large weeping and infected wounds on many seals." The Parks and Wildlife Director, Max Kitchell, said, "a significant number of seals were left with horrific injuries which could be life-threatening."
The brandings, part of a 10 year population study, have now been mercifully stopped by the Macquarie Island government.