Just two examples:
Human = two legs (one pair).
Elephant = four legs (two pairs).
they have 4 pairs of legs
A Spider has Four pairs of legs
Insects have 3 pairs of legs (6)
Most mammals have 4 legs, but some have 2.
Most mammals have 4 legs, but some have only 2.
All insects have three pairs of legs.
Most mammals have four legs, a few have only two.
4
Mammals have a 4 legs besides the dolphin do not have a legs.
They have 5 pairs of "legs" (-> 10 legs) [paraeopodes], but only use 6 of them for walking. 2 pairs have little pincers. They also have 5 pairs (-> 10 legs) of swimminglegs [pleopodes]. This gives them 20 legs or 10 pairs out of which they use 6 or 3 pairs for walking.
Arachnods have 4 pairs of legs.
It has 6 legs in total :)(3 pairs)