Seems most people here missed Oddtrader's post and point above...Here's the blurb again. Read it.
"The largest whale stranding in New Zealand took place in 1918, when 1,000 whales stranded themselves on Chatham Islands."
There was no man-made radiation, no man-made climate change and no "naval sonar at 200+db" in 1918. Whale beaching has been going on for millions of years. And it will continue to happen, whether we like it or not. Mankind, stop trying to be all-that on a planet as old as the earth.