Following the observation of 343 Sei whales found across several beaches in Chile (2015), scientists began utilizing remote sensing imagery to find more dead whale carcasses. This was found to be much more efficient than alternative methods such as physically flying or patrolling a large area in search for whales. Fifty centimetre resolution imagery was used in the experiment, however this technology has been advanced from this time. Researchers are still uncertain of the cause due to this area being secluded, however poisoning or toxic algae is the suggested cause.
https://www.bbc.com/news/science-environment-50040890
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