The Horse Isle2 answer for this riddle is just 'Ridden' -Bareback ;)
A bumblebee has six legs, because it is an insect.
* 12531 legs * You only have two legs, assuming "you" are human or bird.
a spider
20
Mealworms, which are the larvae of darkling beetles, have a total of six legs. These legs are part of their thoracic segments, while the rest of their body is soft and segmented. The larvae also have several prolegs, but these are not true legs.
Horses are quadrupeds, so they have 4 legs.
A bug with six legs has six legs.
A spider with six legs would have six legs.
horses.....
All horses have the chestnuts on the inside of the legs.
If all were horses there would be 428 legs. The shortfall of 36 legs represents 18 chickens so there are 89 horses.
Horses are mammals/animals with four legs.
Six.
A hornet has six legs.
The length of the horses legs will vary according to the horses overall height.
Horses only have four legs... so if you meant to ask "why do horses have four legs" then the answer would be that four legs fit the horses needs the most, for example six legs would make it hard to turn and would make the horse too long. But in the same way two legs wouldn't be enough because the horse would have to stand on its hind legs and since it wasn't made for two legs the horse wouldn't be able to stand up and would fall over.
Six legs