5 · en
Short, simple sentences with “cetaceans”, suitable for children and primary/elementary school, with common expressions and related words. You'll also find examples for middle and high school.
Orcas are very intelligent and social cetaceans that usually live in matriarchal families.
Although cetaceans have a poorly developed sense of sight, they are able to orient themselves by emitting acoustic waves that crash and bounce off coastal features. When the waves return to the animal, they inform it precisely about distances and sizes.
As the boat was positioned at right angles to the group of cetaceans, I recognised the large male dolphin that had suddenly appeared beside us the day before. And I also saw the calf, which was being pushed by the mother, who was immediately behind the male.
One hypothesis is the so-called "leader error". It is explained as follows: sometimes a group of cetaceans prowl aggressively in coastal areas in search of food. If the beach slope or environmental conditions are dangerous, a mistake by the leader is often disastrous for everyone.
"Everyone follows the leader instinctively, and if the leader makes a mistake, everyone makes a mistake," says Greg Early, a biologist at the New England Aquarium in the United States. Dr. Dudok Van Heel, a German scientist, also believes that cetaceans strand because of a combination of unfamiliar underwater landforms, shallow water and storms.
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