DolphinsWithGills

    @EventHandler
    public void onEntityDamage(EntityDamageEvent event) {
        if (event.getEntityType() != EntityType.DOLPHIN) return;
        DamageCause cause = event.getCause();
        if (cause == DamageCause.DROWNING) event.setCancelled(true);
        if (cause == DamageCause.DRYOUT) event.setCancelled(true);
    }