Porpoises and dolphins, both cetaceans, differ in their faces, fins, and bodies. Dolphins have long beaks and cone-shaped teeth, while porpoises have smaller mouths and spade-shaped teeth. Dolphins are leaner with a curved dorsal fin, while porpoises are more robust with a triangular dorsal fin.
Rabbits and hares, both Lagomorphs, differ in size, speed, ears, and legs. Hares are larger, faster, with longer ears and stronger hind legs. They outrun predators, while rabbits retreat to warrens. Hares have black fur markings.
Moths and butterflies, both Lepidoptera, differ in antennae and wing structure. Butterflies have club-shaped antennae and vertical wings, while moths have feathery antennae and tent-like wings.
Llamas and alpacas, both Camelidae, differ in size, ears, and facial features. Llamas are larger with curved ears and longer faces, while alpacas are smaller with spear-shaped ears and smushed faces. Llamas have less hair on their face and head compared to alpacas.
Seals have stubby flippers, lack external ears, and are adapted to water, while sea lions have larger flippers, small flaps for ears, and can "walk." Seals are solitary and quiet, while sea lions are social and noisy.
Opossums in North America are often confused with true possums in Australia. Possums have bigger ears and eyes, while opossums have bald tails. Geographically distinct and named by Captain Cook's botanist.
Crocodiles and alligators belong to the order Crocodylia. Crocs have a longer V-shaped head, protruding teeth, and are more aggressive. Alligators have a U-shaped head, hidden teeth, and are less aggressive.
Wasps and bees belong to the Hymenoptera order. Bees are hairy with flat rear legs for pollen, while wasps are smooth and slender. Bees are docile, while wasps are aggressive defenders.
Aardvarks and anteaters differ in species, location, and physical traits. Aardvarks have claws, while anteaters have long claws and ball up their paws. Anteaters have more fur and small ears, while aardvarks have coarse hair and large ears.
Lizards and salamanders differ in their classification, habitat, body features, and size. Lizards are reptiles, while salamanders are amphibians. Lizards have scaly bodies, long toes, and can grow longer than salamanders, which have smooth bodies and stumpy toes.