CraftBlock cannot be cast to Skull

Hey all! I'm trying to get the placed skull's owner from a BlockPlaceEvent. In my code, after I verify that the BlockType is of Material.SKULL. This works nicely up to this point, it prints "This is a skull!" on chat whenever I place a skull. Then, I try to cast the Block instance to a Skull object, which in my mind should work nicely. However, it outputs "org.bukkit.craftbukkit.v1_12_R1.block.CraftBlock cannot be cast to org.bukkit.block.Skull" to the console. Am I doing something wrong, or is what I'm trying to do simply impossible? Thanks for helping.
My code:

Code:

public void onBlockPlace(BlockPlaceEvent e) {
        Block block = e.getBlock();
        if (block.getType() == Material.SKULL){
            Bukkit.broadcastMessage("This is a skull!");
            Skull skull = (Skull) block;
            if (skull.getOwningPlayer().getName().equals("Ammonium_")) {
                Bukkit.broadcastMessage("This is Ammonium's skull.");
            }
        }
    }

 

@Ammonium_ You need to cast block.getState() to Skull, not the block.