pocketmine\entity\FlyingAnimal::initEntity PHP Method

    public function initEntity()
    {
        parent::initEntity();
        if ($this->getDataProperty(self::DATA_AGEABLE_FLAGS) === null) {
            $this->setDataProperty(self::DATA_AGEABLE_FLAGS, self::DATA_TYPE_BYTE, 0);
        }
    }

 public function initEntity()
 {
     $this->setMaxHealth(6);
     parent::initEntity();
 }