Killers in disguise

We all know the Killer whale.  But what most of us don't know is that this guy is in disguise.

He's not really a whale!

The Killer whale is really... a dolphin! 

He's just a very large and toothy dolphin...  :)

But there are more like him in the sea...more "whales" that are not really whales at all!  

Here they are:

Melon-headed Whale

Killer Whale (Orca)

Pygmy Killer Whale

False Killer Whale

Long-finned & Short-finned Pilot Whale

So what makes a dolphin different than a whale? Size is one important difference, and so is what's inside the mouth. Dolphin all have teeth, but most whales have "baleen" (thick rows of tough hair that act as a food strainer). 

Let's take a look at some these giant dolphins and compare them to real what ways do they look different? 

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