How many different colored Yoshis are there?

Solution 1:

According to the wiki, there are four colors of Yoshi:

  • Red, which spits fireballs when spitting out a Koopa shell,
  • Blue, which will grow wings to fly when holding a Koopa shell in its mouth,
  • Yellow, which will pound the ground (creating "sand clouds") while holding a Koopa shell in its mouth
  • Classic Green, which will do all of the above, depending on the color of Koopa shell it eats.