Giant Amazonian river otters live in large social family groups and are known to pester caimans to drive them out of their territory and they also feed on piranhas
Spotted hyenas are one of the few mammals where the female is the alpha, and not to mention once a male pup is 2 years old they will kick him out of the clan. Also, on a more vulgar note they have what's called a pseudopenis, which is essentially a fake penis that they have to give birth through, and because of this most pups and some mothers die in the birthing process
Black 'panthers' are really just jaguars or leopards with melanism, which causes them to have a excess of dark pigment
A narwhal's tusk is really just a pair of teeth that grows through the animals upper lip
Boutu or Amazonian river dolphins are by far the most aggressive species of dolphin, though their aggression is only out done by the Orca, they have been known to bite and headbutt humans and most attacks are nearly fatal
Beluga whales are the only species of whale with a proper neck
Sperm whales have a collapsible ribcage which allows them to dive to the extreme depths where they often hunt
Surprisingly, not many species of penguin live in cold climates
Albatross spend over 50% of their lives flying over the ocean
Flamingos and roseate spoonbils get their pink coloration from the shrimp they eat
Lammergeiers mainly feed on the bones of dead animals instead of the actual carrion
The Secretary Bird mainly hunts snakes and will kill it's prey in multiple ways, sometimes by stomping on the serpent with it's talons or dropping it from the sky
Hoatzin have a small pair of claws on their wings as hatchlings, which they use to climb trees and such
Sword billed humming birds can't preen themselves due to their massive bills so they instead scratch themselves to get rid of parasites and such
Blue Jays, despite their beautiful and seemingly harmless appearance, often raid the nests of other song birds and will eat any chicks or eggs that they find
ShoeBill's often will favor the strongest chick of the clutch and will only take care of that chick, and not to mention when the mother leaves the nest the favored chick will often 'bully' it's siblings and will end up killing them most of the time
There is a species of crocodile called a mugger
The Florida everglades is the only place in the world where alligators and crocodiles live together
There is a species of desert skink called a sandfish
Most species of snakes are cannibals, and the females, like spiders, will often eat the male after breeding
The yellow belly sea snake is the only species that lives in the open ocean
There's a species of giant slamander called a hellbender
In most species of aquatic newts a male will grow a large sail/fin during breeding season
Salamanders are just fully terrestrial newts
A Greenland shark can live over a hundred years, and the oldest specimen is a male that's believed to be 512
