Adaptation

They have long claws to dig into the ground or tear things apart like skin.
They have canine teeth to eat. They can bite into flesh and meat.
They have a bark to communicate with other dogs or to intimidate
They have fur to keep them warm and protect their skin
some dogs have ears that help them hear far away and some dogs have floppy ears to protect their ear drums.
Longhorns have horns to defend themselves and their babies from predators by charging at the predator and swinging their horns around.
Strong immune system protects them from disease and they can live 20 - 30 years
Thick hooves so they can travel more then other types of cattle.
They have flat teeth to eat plants and they can tolerate eating a wider variety of grasses then other types of cattle.
Wide variety of colorations their pigmentation protects them from UV rays from the sun.
Deer have scent glands on their forehead and they pee on their tarsal gland on their back legs because they communicate with scent
Whitetail Deer have thousands of scent receptors so they have a very strong sense of smell
Deer have hard hooves to travel on rough terrain
They also have a very good sense of hearing that helps them communicate from a distance and hear predators coming.
they have white tails so that if there is danger and they have to get away they flash their white tail and other deer no to run away