Dolphin
Free PNG images in the category “Dolphin”: 1 files with transparent background, no sign-up.
Bottlenose dolphins leaping in an arc, pairs jumping side by side, cartoon dolphins with wide smiles, tribal outlines and blue silhouettes over waves.
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Mammal, not fish
In Animals the dolphin sits next to sharks and whales, and the three get confused all the time. A dolphin has a short beak, a curved dorsal fin and a horizontal tail. A shark has gill slits and an upright tail. For a children's book or an aquarium sign, those details matter.
The leap
Most dolphin images show the jump out of the water. The arc shape fits naturally over a heading or around a round logo, and a pair of dolphins mirrored left and right makes a ready emblem for a swim club or a seaside hotel.