The long-lived ancestors

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The Eagle went last of all to the Frog and desired to know the Owl's age. He answered, "I never ate anything but the dust from the spot which I inhabit, and that very sparingly, and dost thou see these great hills that surround and overawe this bog where I lie? They are formed only of the excrements from my body since I have inhabited this place, yet I never remember to have seen the Owl but an old hag, making that hideous noise, Too, hoo, hoo! always frightening the children in the neighbourhood."

So the Eagle of Gwernabwy, the Stag of Rhedynfre, the Salmon of Glynllifon, the Blackbird of Cilgwri, the Frog of Mochno Bog, and the Owl of Cwm Cawlwyd are the oldest creatures in the whole world!