1.   Top predators, such as toothed whales and dolphins, can accumulate large quantities in their tissues if they keep eating contaminated prey.

2.   When whales eat contaminated prey, organochlorines go first to the digestive system, and are then deposited in fatty tissues.

3.   As a result, some scientists advise hunters not to eat this prey.

4.   He began collecting black widows to study how they killed and ate their prey.

5.   PCBs and some other toxins accumulate at higher levels in transient orcas because they eat prey that is higher up the food chain than the resident whales..

6.   Some just eat the prey before the hunter can catch up.

7.   Unlike most animal killers, which eat their prey, dolphins seem to have murderous urges unrelated to the need for food.