3 Answers. A player can spawn on any solid block which is not affected by gravity and is below the sky, so there are no blocks above it. Animals spawn on grass or dirt exclusively (block id 2 and 3). They also require a light level above 9 and at least 2 blocks of air above them.

What can mobs not spawn on?

Most mobs never spawn on transparent blocks, in water (except fish, dolphins, turtles, and other aquatic creatures), in lava (except for striders), on bedrock, or on blocks less than a full block tall (such as slabs placed on the bottom half).

What blocks prevent mobs from spawning?

Ways of preventing mobs from spawning in Minecraft

To prevent this, players can use blocks that emit light, such as torches and glowstone, in areas where they want to prevent these mobs from spawning. Torches are one of the easiest light-emitting items to craft as they only require sticks and coal.