some leaves have a speckled brown color & some birds have a speckled brown color ->  some birds look like leaves  a bird is a kind of thing & things that looks like other things are difficult to distinguish from that other thing ->  birds that look like other things are difficult to distinguish from that other thing  some birds look like leaves & birds that look like other things are difficult to distinguish from that other thing ->  some birds are difficult to distinguish from leaves  some birds are difficult to distinguish from leaves & difficult to distinguish can mean difficult to see in something else ->  some birds are difficult to see in leaves  some birds are difficult to see in leaves & hiding means ability to be seen decreases for camouflage ->  an example of camouflage is a bird looking like leaves  an example of camouflage is a bird looking like leaves & camouflage is used for hiding by animals from predators ->  looking like leaves can be used by birds for hiding from predators  looking like leaves can be used by birds for hiding from predators & hiding can be used to avoid something -> looking like leaves can be used by birds for avoiding predators