Platypuses are only related to seals and otters in that they are all semi-aquatic mammals. Even there, the similarity is flimsy, because seals and otters are placental mammals, whereas platypuses are monotremes, or egg-laying mammals, one of only two types of such animals in the world.
humans, seals, otters
seals, and pelicans, and otters
yes, yes they are
no, they are just different marine animals
Whales, seals, otters, beavers...
Of course. School children have more understanding of a platypus than they do of creatures such as otters and beavers, which are so familiar to Americans.
They are from the same super-family of Arctoidea, which in turn splits into the super-families of Pinnipedia (Seals, sea lions) and Musteloidea (otters, ferrets, weasels, etc)
We kill otters in nets sometimes other than that large sharks have been known to kill otters but mainly mistaking them for seals etc.
elk,seals,salmon, sea otters,and whales
Tillamook people ate seals,salmon,sea otters, and whales.
The platypus is not related to birds. They are monotremes. (mammals that lay eggs.)
otters seals and hippos crocodiles and alligators