and low visibility hinder studies of migrating aquatic animals by traditional techniques alone. Sonar, a cousin to radar, uses acoustic as opposed to electromagnetic signals to detect targets in ...

Animal migration has fascinated humans for millennia. And for good reason: Some of the most astonishing feats of endurance are performed by long-distance migrants, such as the nine-day non-stop ...

(Arterra Picture Library / Alamy Stock Photo) Migration can happen around the world at any time. But it's most common for animals to migrate when the seasons and weather conditions change.

In recent years, this ancient migration cycle has been blocked by ... The adults are predators that consume any aquatic animal that can be swallowed, while the young feed on insects, larvae ...