I'll be the first to admit that luck plays a BIG role in N/W shooting. Here's my last experience.
My daughter and I were walking through a park the other day when I spot what I initially thought was an extraordinarily large monarch. Getting closer, I see that it was in fact two smaller viceroys nearly touching at the head (first image).
Trying to follow them as they spun around on top of the bud, a third butterfly literally lands on one of them briefly. Luck because all three just happened to be within the DOF at that moment.
I never did get a successful shot of just the two of them.
Oh, if you're wondering what's causing that white background - it's the concrete pavement in the background which happened to get in the way from this particular vantage point. Looks artificial - but works I think for this shot.