I had a similar experience when we had an evening walk from the boat a couple of days back, but with bunnies, not butterflies. There were a lot around but with long grass, poor light and the rabbits running into nearby bushes or burrows, I only got the hazy distant snaps. This particular warren had the unusual feature of some black rabbits among the wild, better camouflaged, colouration. We stayed put for a day and I went for a short outing and had again lots of sightings. The black and brown rabbits were equally common.