There are many different types of penguins in the Antarctic. Though there's only a few species talked about most, there's 17 of them all together. While some are very peaceful birds, others can be incredibly anti-social and territorial. The smallest and the least territorial of the species are the "Little Penguin" (Eudyptula Minor), Adelie penguin, and Macaroni penguin. These species have never been documented as aggressive or known to hide from other species or shun. Scientists have said that one of the main reasons for this is their more peaceful lifestyle. These tiny and maladroit penguins above typically only eat krill and their groups that they travel with are a significant amount smaller than langer penguin species. These penguins are also far more loving and in tune with their mates. The larger penguins that have been known to be more aware with their surroundings are the Emperor penguin (most known and studied penguin), the King penguin, and the Yellow-Eyed penguin. Penguins are not scary animals that will go and attack people studying them or hurt them. What I mean in this case by territorial is they will protect their family (the group they travel with) by completely moving to another location, out of view or way from the people there, and even away from other species of penguin. The larger penguins also hunt larger for food (cephalopods = large squid) and have many more predators than other types of penguins. Another reason they're always on lookout for things. According to the Red List of Threatened Species from the International Union for Conservation of Nature, four penguin species are endangered: Northern Rockhopper, Erect-Crested, Yellow-Eyed, Jackass and Galapagos penguins. Most of the other species of penguins are listed as vulnerable or threatened. These species are not studied much anymore and are also (of course) not allowed in any type of captivity. Though penguins are so beautiful, my favorite animal, and my favorite to visit at the New England Aquarium (it's the closest I can get to them), they're at their best (and you can tell) and healthiest not in captivity. Like most animals. Penguins to me are the best animals to study and to learn about because you'll never be bored. The penguins themselves keep learning and doing new things to surprise and with 17 species, we're always finding something new about one of them. So very different but also all still the same. The best thing about them though is that they mirror so much of us. Ebullient, curious, and protective over the ones they love. Sounds like us.