WHY DO WHALES EAT PLASTIC? We have been bombarded lately with news that the stomachs of the sperm whales recently beached in the North Sea were full of plastic. It happens quite often. The question is why? It's important because if we understand why whales eat plastic before they beach, then we will know the answer to the centuries-old mystery of whale whales mass strand. Hint #1: Healthy deep-diving whales can tell the difference between a nice juicy squid and plastic garbage floating on the surface by using a high-frequency echolocation and identification system similar to our ultrasonic medical imaging only 1,000 times better. Dolphins have even been known to use biosonar to tell the difference between pennies minted 50 years ago and the ones minted today based simply on the acoustic reflectivity of the extra copper in the older coins. Dolphins can even use their biosonar to tell when a female is a few months pregnant. The amazing visualization syste...