Slow lenses and low sensitivity photographic media made it challenging to capture images of wildlife in the early days of photography.Prior images of animals were frequently of ones that were in captivity. Among these were images of lion cubs captured in 1854 at the Bristol Zoo and images of Frank Hayes' final Quagga in 1864.With the introduction of faster shutter speeds and photography emulsions in the 1880s, wildlife photography became more popular. As a result of advances like this, images like the ones captured in 1884 by German photographer Ottomar Anschutz—the earliest images of wild birds in flight—are possible. In the Philadelphia region in 1897, members of the Delaware Valley Ornithological Club (DVOC) took the first pictures of songbirds in nests. 

Wildlife Photography's Effects : 
In order to capture imperiled species and their habitats, wildlife photographers frequently work with scientists and conservationists. This collaboration produces invaluable data that can guide conservation plans. Their photographs operate as a call to action, imploring people, groups, and governments to act quickly to save the species on our earth. 
Consider the case of David Doubilet. Doubilet is a well-known underwater photographer who has produced striking pictures that show the condition of the aquatic ecosystems on our world. 
His moving art focuses on how harmful human activities, ocean acidification, and global warming are killing off coral reefs. 
Doubilet captures the change of once-vibrant reefs into ghostly, bleached skeletons through his lens; it's a somber mirror of our times. 

You might not want to photograph some animals using a 50mm lens. You can’t even get close enough to some animals to photograph them.
The solution to this is a remote shutter release. This allows you to release the shutter without touching the camera.
This piece of equipment is also great for long exposures. Touching your camera while the shutter is open for extended periods could create camera shake, ruining your image.
That is the last thing you want for that once-in-a-lifetime shot. Some are wireless systems. And others don’t require batteries and cost less than $10.

If I could only keep one rule on this list, it would be this one: Don’t shoot wildlife directly illuminated by the unobstructed, midday sun. It is almost impossible to get a good shot under conditions like that. You’ll usually end up with harsh shadows on your subject and no catchlights in their eyes. Harsh lighting also often gives a reduction in apparent sharpness due to glowing effects from feathers and fur.

And it’s not just the subject. Backgrounds in such light will often have harsh, specular highlights, stealing attention away from your subject (as in the shot below). When I’m editing my pictures, I rate my photos from 0 to 5 stars, and midday sun shots almost always get 0 stars!