Animal Planet
Do you remember when Animal Planet spent more time discussing animals and less time discussing people? People probably wouldn’t say things like this if they continued to do that, so you’re right about that. Dolphins, like all mammals, take in oxygen through their lungs and exhale it out through their mouths.
In spite of this, dolphins do resemble fish quite a bit, and as a result, we are willing to give people a sliver of leeway when it comes to their certainty in calling them fish. This is because dolphins do resemble fish quite a bit. However, this is not the case at all.