How do you weigh a whale without bothering it? Drones

Whales are the largest animals on the planet and important predators in the marine ecosystem. As a marine biologist I have been lucky enough to see them up close. It’s an amazing experience to watch a whale mother, 14 meters long and weighing nearly 40 tonnes, gently push her “tiny” five-meters baby, already weighing nearly one tonne at birth, up to the surface to breathe. But how do I actually know that whale weighed 40 tonnes? After all, we can’t exactly capture an animal the size of a bus and simply put it on a scale. And swimming out into…

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