However, they do not usually travel very far. For instance the killer whale has one of the longest known gestation periods which can last up to 17 months. In the Southern Emisphere's summer, mature males move to Antarctica to feed. Sperm whales are very difficult to study because they spend most of their time in open water, away from coastlines. In fact, it is renowned for being one of the longest migrations in the animal kingdom along with the Gray Whale. In addition to the direct threat posed by active sonar, it may indirectly harm marine species by causing changes in behavior.
Sperm whales have disproportionately small eyes so it is thought that they do not see particularly well.
New Jersey Endangered and Threatened Species Field Guide
Collisions with ships are an increasing threat to sperm whales. Sperm whales have disproportionately small eyes so it is thought that they do not see particularly well. This question is for testing whether you are a human visitor and to prevent automated spam submissions. A typical family unit is comprised of about a dozen females and their young. Just a few hundred animals are thought to still exist.