Whales do eat jellyfish, although it is not an essential part of their diet. Some whales eat quite indiscriminately and attack everything that comes their way in the ocean. As a result, jellyfishes often come under attack, but they are 95% water and do not carry any essential nutrients needed by the whale for sustenance.

Whales do not eat dolphins except for the exception of killer whales. Whales mostly prefer to eat much smaller marine creatures, although toothed whales consume larger fishes and even seals in some cases.

Seals aren’t eaten by all whales, just as all whales don’t consume plankton. Despite this, apex predators like killer whales, or orcas, have been observed catching seals. These mammals float in pods, and their meals are determined by the location they live in and the pod’s hunting strategy.

Whales eat penguins, but only a few of them. Most whale species do not prey on penguins and prefer feeding on krill, fish, shrimp, crabs, and the like. Penguins are eaten by toothed whales such as killer whales and, to a certain extent, sperm whales. However, killer whales are their most fierce predators.

Whales with teeth are classified as apex predators, and many of them prey on birds. Killer whales are one of the toothed whales that have been discovered feeding on birds. They are also known to devour big white sharks in addition to birds.

Whales eat krill, but not all of them. Nevertheless, these tiny shrimp-like invertebrates are abundant beneath the ocean’s surface and provide a significant portion of the nutrition for these massive creatures.

Whales with baleens but no teeth prefer to eat shrimp, krill, planktons, and other small sea creatures. Having said that, each whale species has its favorite food, and not all of them eat the same things.

Whales do have ears. But, even though they have external auditory canals, their functionality is questionable, just as it is in the case of all cetaceans. It is believed that whales have an especially designed sound system that helps them hear sound underwater. As such, they can easily hear sounds underwater and also communicate with ease.

Whales sleep for about 30 minutes at a stretch. Some whale species sleep for no more than 10 to 15 minutes at one go. This is because sleeping for longer durations will lower the body temperatures of whales, which can be detrimental to their being. Moreover, whales need to keep swimming to breathe or to escape predators.