A friend of mine has discovered a large cash of Bumblebee documentaries, here. They're in German but some have English, or "Englische" as they spell it, versions. The text in each video doesn't translate but the eloquently spoken narrator does and shows off an impressive vocabulary at times.
A few highlights. (Note I didn't translate the titles, these are just what I'd call them.)
The Life and Death of a Bumblebee Colony
A Closer Look at Nest Construction
A Closer Look at Pollination by Bumblebees