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Cockatrice egg

From the RuneScape Wiki, the wiki for all things RuneScape

The Cockatrice egg is a "bonus" drop from a Cockatrice (level 37 combat), which makes it among regular drops from this creature. It is used in Herblore and Summoning.

It can't be incubated at a pet shop.

They can also be made from a normal chicken egg by using the Spirit cobra's scroll Ophidian Incubation.

Also note that having a Spirit Cockatrice familiar seems to boost the odds of getting the drop of a cockatrice egg while fighting against Cockatrices, and the Spirit Cockatrice will also create one every now and then.

[edit] 2008 Easter Event

In the 2008 Easter event, the Easter Bunny had people dip a cockatrice egg in chocolate. This would make it a chocatrice egg. They would then incubate it and out would pop a chocatrice.