Goose Hydra (4e Creature)
From D&D Wiki
The goose hydra is a ferocious being capable of downing unsuspecting knights in a flash. They are dangerous in that their docile appearance deceives without effort, and by the time their enemy realizes, they will have triggered its innumerable wrath. As the name suggests, the goose hydra is a being with multiple heads. It is commonly found in wooded areas like forests, appearing like a normal goose. It also mates with normal geese, which makes its offspring all the more volatile, as each egg has a chance of being a new hydra baby.
A character knows the following information with a successful skill check.
Nature DC 18: Legends of the hydra regenerating heads being disproven are untrue for the goose hydra, which is capable of this feat.
History DC 20: The goose hydra came about as the result of a horrific joke gone wrong. As you may expect, wizards love being funny smart alecks who fudge things up for everyone else when their experiments and jokes go too far. This was the result of what happens when one of those jokes tick a powerful archdruid off.
Nature DC 20: The goose hydra loves bread. It will eat bread infinitely, but never becomes more loyal to the feeder.
Unlike hydras with their lairs, goose hydras are fairly solitary and wander around among other geese at most for company.
The goose hydra is exactly what it sounds like. It is normally a simple-looking, one headed goose. However, when attacked, its true wrath shows. It knows no fear, and its challenger will soon realize their own grave mistake when the heads become two, four, eight... and more. Hydra gooses are known to be invincible and never stop growing heads. It is said they may be distracted or appeased by bread, which allows a person to run away with their lives at least.
The goose hydra, even when it only has one head, fears nothing. It just honks and attacks like mad as long as it is alive. And due to its uncanny ability to rejuvenate endless heads, this means it will never stop fighting. While this is simplistic, it is an effective strategy. The goose will regenerate as many heads needed to murder and bury its enemy in a mess of honking heads.