One of the toughest challenges for a nature photographer is to show how well a critter’s camouflage works. If the critter has blended-in nearly perfectly, they’re hard to highlight. Here a couple examples and how I handled them.
The great gray owl was almost invisible against that evergreen tree he was in. With his eyes closed, or nearly so, there wasn’t much of a shot. Patience paid off when he finally opened both eyes while half in the sunlight.
With the American bittern, the solution was to get in close (actually with a 500mm lens and a big crop) and use a wide aperture (small F-stop number) to blur the foreground and background.