Because they feel like it
They lay down front feet first.
Yes, most horses typically stand by bracing their front feet and then rolling their hindquarters to set their hind feet underneath them.
Dung beetles stand on their front feet and push the dung with their hind feet
The back legs are webbed because they are stronger. a frog uses its back legs to jump, and to swim. they hardly use front feet for swimming.
Front feet first, followed by the head, then the torso, then the hind legs.
Kangaroos' feet do not have any particular name. They have hind legs and forelegs.
Right hind, left front, Left Hind, Right front
The feet of the hind limbs have 5 toes.
Three long, curved and sharp claws on hind feet and front feet
There are normally 3 nails on each back foot and 3 on each front - totalling 12 nails on an elephant. Note that these are not actually toe nails in the typical sense and are not directly linked to the number of digits in the foot. Apparently, Asian elephants have 4 nails on the back feet and 4 on the front.
It really depends on the animal. Some animals' feet are simply called feet. However, some of them have specific names. For some, like the dog, the feet are called paws. For some, like the cow, the feet are called hooves.
African elephants have four toes on the front and three on the back. site: http://edhelper.com/AnimalReadingComprehension_17_1.html