Giant Oyster - The RuneScape Wiki

The Giant Oyster is a monthly Distraction and Diversion within the sunken Tutorial Island that is accessible upon completion of Beneath Cursed Tides. Players can collect and catch items to feed to the oyster, receiving Fishing and Farming experience from doing so. Once fed, the Giant Oyster will close its mouth, preventing further feedings. The following month after being fed, the Giant Oyster can be checked, opening to reveal treasure inside for the player to collect.

RuneScape Travelling Merchant guide: The best items to purchase

Lobstrosity, Old School RuneScape Wiki

Giant Oyster - RuneScape Guide - RuneHQ

10 Runescape Tips & Tricks That BLEW My Mind!

Giant Oyster - RuneScape Guide - RuneHQ

Effigy Incubator - The RuneScape Wiki

Update:This Week In RuneScape: The TzekHaar Front - The RuneScape Wiki

Wilderness Flash Events - The RuneScape Wiki

Agoroth - The RuneScape Wiki

Update:Halloween Event Begins! - This Week In RuneScape - The RuneScape Wiki

Clan Quest - Questaholic - November 2013

Giant sea rat, RuneScape Wiki