Otters numbers declined dramatically from 1957 due to chemicals such as PCBs which were released in river systems and accumulated in the food chain, poisoning otters. Sport hunting and discrimination by farmers and fishermen also played a role. To prevent extinction those chemicals and hunting were banned, less water was taken from rivers where known… Read More
Baitballs – what are they?
When fish feel threatened by predators, they group together – lone individuals are more likely to be eaten than individuals in a group! Predators such as porpoise, auks or minke whales drive the fish up from the depths to the surface where they cannot escape – and then seabirds take advantage by diving down from… Read More