All the yoshis live in harmony. Yoshi first meets Mario on the island.
Yoshis are Yoshisaurs. Often called "Yoshis" for short!
The world is vast so while Mario will often encounter Yoshis. He always helps them so they help him back in return.
All the Yoshis have different personalities. You might see the same colored Yoshis but they won't be the same.
Yoshi has had many different appearnces. He's appeared as a sidekick and main character. He is main character in Yoshi's Wooly World. He is a sidekick in Super Mario Galaxy