While sailing in the Pacific Ocean, an American hunter saw something strange. He noticed that hunting was down by 58 percent. Some kinds of whales, like sperm whales, were hard to find. The sperm whales did something interesting to protect themselves.
They formed circles to defend against predators. This helped weaker whales stay safe. It also made it tough for hunting ships to catch them. The northern and Pacific whales learned to deal with their new environment this way.
Scientists saw how sperm whales helped each other. They worked together to find new ways to stay safe. Sperm whales are hunted for their oil, which is used for making candles. They use special strategies to keep in touch with each other.
Whales have the biggest brains of any animal. Their brains are five times heavier than human brains. They spend most of their lives swimming across oceans, looking for food. Sperm whales can dive really deep, up to 1,200 meters. They talk to each other with sounds, even in the dark. These sounds can be as loud as 270 decibels. Sperm whales often live in groups with their families.
They have a special way of communicating called codas, like Morse code. This helps them recognize each other. Researchers have found many different codes that they use.
