Per Minecraft Wiki, if it fails that 5% chance, there is an additional 5% chance of the baby zombie spawning mounted on a new adult chicken. Each spawned zombie has a 5% chance of spawning as a ...

Within the Minecraft game, a chicken jockey is a baby zombie riding a chicken, an extremely rare phenomenon in the game that ...

According to Minecraft Wiki, Chicken jockeys are the rare appearance of a baby zombie, baby zombified piglin, baby zombie villager, baby husk, or baby drowned riding on the back of a chicken.

Then they have to hope the zombie is a baby, another rare occurrence, and that a chicken is close enough that they spawn on top of it. The Minecraft Wikipedia page breaks down the probability of a ...

and then cross their toes that a chicken is close enough that they might spawn on top of it. The Minecraft Wikipedia page gives the probability of a chicken jockey’s appearance. “Each baby ...

(Or at least, as much as an adult non-Minecraft-player can ... Apparently in the game, baby zombies “spawn” all the time — but a baby zombie riding a chicken is an exceedingly rare occurrence.