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Whales suffered greatly during the Second World War. This is probably due to naval battles and the explosion of bombs and mines under water. American and British scientists write this in the magazine Nature Communications .
Researchers studied earworm, humpback whales and blue whales. These corks are in natural history museums around the world. In this ear wax, you can discover the hormones that animals have produced in their lives and the type of pollution they are exposed to. The oldest accessory dates back to 1870, the most recent in 2016.
During the Second World War, whales were found to produce a lot of cortisol. Cortisol is a hormone produced under stress.
Whaling was also a source of stress for whales. In the twenties and thirties of the twentieth century, tens of thousands of fin whales and humpback whales were killed. During the resumption of whaling in the 1960s, whales also made more cortisol, which was stressing them
. Since then, however, it has increased again. This may be due to the increase in shipping traffic, pollution and rising sea temperatures.
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