Penguins around the world face a variety of threats, many related to changes in their food supply as a result of human activities (overfishing, or human-induced climate change).
But they also have to contend with predators in the wild, including leopard seals and orcas. In at least one case, for one gentoo penguin, the human activities made a difference. Watch what happens with a gentoo pursued by a pod of orcas while folks in a whalewatching Zodiac looked on. (Apologies in advance for the wretched soundtrack.)