Find a chicken
Find a baby zombie, baby zombie villager, baby husk, baby drowned, baby zombie piglin, or baby zombified piglin
Let the baby mob ride the chicken
Use a spawn egg or commands if needed
In Java Edition, use `/summon chicken ~ ~ ~ {Passengers:[{id:”minecraft:zombie”,IsBaby:1b}]}`
In Bedrock Edition, use a spawn egg combination or commands if available
Keep the chicken and rider together with a lead or enclosed area
Avoid killing either mob if you want the chicken jockey to stay intact