It was kind of a dick move to create animals that require air, then confine them to the freaking ocean
If you are talking about dolphins they used to be wolf like creatures that due to scarcity of food they had to hunt in water so they slowly evolved into water mammals, dolphins still have claw bones but they are unnecessary and dolphins will get rid of them with time and will develop abilities to breath under water
(This also partially applies to whales)
They were what now?
Mother Nature, come out here I just want to talk
Whales are actually Ungulates, more so hippos, entelodons, etc…
Meaning they were somewhat related to big celebrities such as Daedon (the “hell pig”) and Andrewsarchus.
The appearence of the first ancestors of whales probably looked like a small hoofed thing called Indohyus.
(Illustration by julio lacerda)
(illustration by Tiffany Turill)
Basically they went from tiny hoofed herbivore to bigger hoofed carnivore to crocodile-like thing to seal-like things to big sea predators.
It’s important to mention that we now know dolphins will probably never need to develop true water breathing, because the fact that they breathe air from the surface is actually an ADVANTAGE for them. They get more oxygen at once than an animal with gills and it permits a much higher, more energized activity level for longer periods of time.
They are murderous monsters empowered by their access to the forbidden air
Humpback whales are known for their haunting songs, which are complex sequences of moans, howls and cries that often continue for hours, according to National Geographic. Only male whales sing, so scientists think they are trying to attract potential mates.
A male may sing for hours, repeating the song several times. All males in a population sing the same song, but the songs of each population are different. For example, whales in the North Atlantic sing one song, while whales in the North Pacific sing another song, according to the NOAA. Songs gradually change from year to year.
Songs can be heard 20 miles (30 km) away, according to the NOAA.
This is a dwarf sperm whale (Kogia sima). Kind of looks like a tiny harmless shark!
False and pygmy sperm whales actually have “false gills” behind their eyes, which, combined with their underslung jaw, makes them superficially resemble sharks.
They also can expel a reddish-brown fluid from their bodies when frightened and hide in the cloud that it makes, much like a squid or octopus does when they’re frightened.
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Urocyon's Jaunts 2.0 
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