Let's go through this step by step:
It really depends on the foal. When you are trying to wean them, oats or grass is good. When we weaned our foal, we let her share oats with her mother, eventually separating the oats into two bowls.
Horses are mammals, and so the females of the species (the mares) produce milk from their mammary glands which provides nutrition, antibodies, and a gut bacterial culture that can begin to digest their food to their foals.
Foals eat in the same way that most baby mammals eat, they suckle until they are old enough to begin nibbling at grass or hay. Once they are old enough to do this they eat in the same manner as any adult horse.
It is in their nature to drink milk from their mother. This milk should give them all the nutrients they need. At 1-3 weeks old a foal may start to nibble on hay.
Female horses have teats to feed their young.
When calves start eating grass they also start ruminating.
Most foals don't need to be dewormed until they start eating grass on pasture; even then, provided the adult horses have been regularly dewormed there isn't much need for a foal to be dewormed. I would suggest not developing a standard program, but rather working with your veterinarian to address worming issues as needed in specific foals.
Young kids will start to mimic their mother at about two weeks of age and start nibbling on what their mother is eating.
no because their legs are to long
Eating grass is a sign of an upset stomach.
yes. Grass eating animals, or herbivores, are considered to be primary consumers
The deer would be called a consumer because its eating the grass
Deers are vegetarians. It's not hard to walk up to leaves, berries, or grass and start eating.
A zebra foal will start eating grass, or at least mimic what its mother eats as young as a few days to a week old. Most of the time, though, the foal depends on its mother's milk for nutrition over the more coarser and harder-to-digest grasses of the African savannah.
no
no grass spiders do not eat grass. They get their name from living IN the grass NOT eating the grass.
There are zebra foals and pony foals, so yes.