Although it might sound very unusual, a whale and a giant squid may indulge in a fight deep in the heart of the marine world. These two animals are vastly different from each other in every common respect. A whale is a vertebrate and giant mammal, while a squid is a cephalopod, an invertebrate closely related to the octopus.

Whales eat plankton, but not all of them. Toothed whales can bite and chew their prey and as such, they feed on fish, squid, crabs, and octopuses among other animals. On the other hand, baleen creatures like the right whale, humpback whale, and blue whale prefer consuming plankton, which is easily found in the ocean.

False killer whales have such a name owing to the shape of their skull, which resembles the skull of killer whales. However, the false killer whales are not deeply studied as killer whales and experts are yet to learn about them fully. Both these are mammals and belong to the dolphin family. 

Whales communicate via a variety of sounds. To be precise, according to experts, whales interact via a complicated range of noises, such as whistling, chirping, clicking, and so on. All these are collectively known as whale sounds.  Whales, however, lack a vocal cord and make sounds by squeezing air through the throat.