Hand holding bumblebees found dead. Depletion syndrome, toxic nectar or neonicotinoid?

destruction of biodiversity summer france person group imago hand carry to death fatigue overview bumblebee bombus july symptom threat to biodiversity threat to biological diversity destruction of biological diversity human beings persons human being human presence human presences human humans groups grown up stage adult imagos grown up stage adults hands transport to hold carried carrying held holding transporting transported transportation deaths dead woman dead women exhaustion exhaustions tired tireness exhausted exhaust tiring exhausting overviews global sight global sights full length bumblebees symptoms environment temperate season seasons atmosphere european union europe individual enumeration stage of development morphology zoology morphology organism behavior health shot hymenoptere insect wild animal animal apidae apoidea aculeata hymenoptera hexapoda / insecta tracheata / antennata arthropoda articulata protostomia coelomata bilateria metazoa opisthokonta eukaryota