Rabbits are not spawning in forests and plains biomes

When I went into a forest biome looking for rabbits (I was looking for at least 30 minutes) and I never saw anything. After a while I gave up and opened a desert world, I saw a desert full of golden rabbits! Please fix this issue, I hate not finding rabbits in my other world. My friends are having the same issue. They are running iPod 5 and version iOS 9.