It’s happened many times, but we do not know why it continues to happen. 470 whales beached in Australia on 22 Sep 2020. While rescuers worked hard to get them back to sea, many of them have already died. Such incidents have occured in coastlines around the world. It is sad that they continue to happen.
Could it be because the whales have ingested toxic material? Is it because the oceans have warmed? Is it another climate change effect? Or is it just their way when reaching end of life? No one knows. Check out this article.