Climable

@Override
    public void onUpdate()
    {
        super.onUpdate();

        if (!this.worldObj.isRemote)
        {
            this.setBesideClimbableBlock(this.isCollidedHorizontally);
        }
    }
    public boolean isOnLadder()
    {
        return this.isBesideClimbableBlock();
    }

    protected void entityInit()
    {
        super.entityInit();
        this.dataWatcher.addObject(16, new Byte((byte)0));
    }
        public double getMountedYOffset()
    {
        return (double)(this.height * 0.5F);
    }

     public boolean isBesideClimbableBlock()
    {
        return (this.dataWatcher.getWatchableObjectByte(16) & 1) != 0;
    }
    public void setBesideClimbableBlock(boolean p_70839_1_)
    {
        byte b0 = this.dataWatcher.getWatchableObjectByte(16);

        if (p_70839_1_)
        {
            b0 = (byte)(b0 | 1);
        }
        else
        {
            b0 = (byte)(b0 & -2);
        }

        this.dataWatcher.updateObject(16, Byte.valueOf(b0));
    }