Whales, Dolphins, and Porpoises: Cetacean Biology

Why this matters

A humpback whale song that starts in one population can spread to a population that never encountered the original singers. That kind of transmission only makes sense once students know what separates whales from most animals they have studied before: baleen whales filter krill through baleen plates, toothed whales hunt using echolocation and an organ called the melon, and both descended from land mammals that returned to the water.

What changes once students read this is how they talk about intelligence in animals. A song spreading between populations that never met is evidence of culture, not instinct, and that single case study does more to make the point than a lecture on brain size or social structure ever could.

From one teacher to another

Cetacean biology covers how whales, dolphins, and porpoises evolved from land mammals into fully aquatic animals. Students read about the split between baleen whales, which filter krill through baleen plates, and toothed whales, which hunt using echolocation. The passages also cover deep diving adaptations like myoglobin and blubber, along with the social structures dolphins and orcas use to communicate and hunt in groups. The case study on humpback whale songs asks what the spread of a song from one population to another says about cetacean culture. The worksheet includes a teacher answer key.