They use thier flippers and their feet
The difference is that turtle limbs are made for swimming and tortoise limbs are not.
Swimming
Swimming and reproducing
by swimming in the ocean
at 234 miles
Penguins.
yes penguins are too heavy to fly. and their wings are used for swimming.
Penguins catch fish with their bills and swallow the fish whole while swimming.
Penguins don't have gills. Penguins have lungs, like all birds. They've simply opted for swimming instead of flying.
penguins have a beak.
Penguins have flippers.
They don't learn swimming, its instinctive.