The following images are butterflies with transparent backgrounds.

greyscale picture of 5 butterflies with top-right butterfly in color

greyscale picture of 5 butterflies with middle-right butterfly in color

greyscale picture of 5 butterflies with bottom-right butterfly in color

greyscale picture of 5 butterflies with bottom-left butterfly in color

greyscale picture of 5 butterflies with top-left butterfly in color