You might boost the ISO to get a properly exposed image.
I like to shoot when the sky is overcast. This diffuses the sunlight, so the lighting is cast evenly across the frame. In addition, clouds create a neutral hue, and the camera can capture the natural colors of the animal and its surroundings. An overcast sky or hazy sunshine eliminates or subdues the shadows and helps bring out the details of fur or feathers. You might boost the ISO to get a properly exposed image.