I went back to the Zoo site and got this version of the image:
I converted to B&W then
inverted the colors & added some bridges. In this image, cut away the black (the gray in the color .png version). For this pattern, use a light colored back board, or paint it to match the light blue and off-white colors of the poster. Paint the cut-out image (the front board) black. Then it will match the poster.