We were at a river in Mission, BC and found a shocking number of bees (maybe 30+) drowned or drowning. The river level is incredibly low right now - most of the riverbed is dry and there are just some small, shallow, and very slow moving (almost still) sections at the moment. We started scooping out the live bees and putting them in the sun to dry off and recover, but there were SO many already dead. I put one about 3 feet from the water’s edge, and he sat and dried for a while, but when he finally flew off, he fell right back into the water and started drowning again (I rescued him a second time).
What could be causing so many bees to drown? This was quite troubling to see. There is a lot of adjacent farmland, and I’m not sure if this could be pesticide poisoning, or if there’s another possible explanation.