Endangered Weasel
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You need to befriend Gwen and Woody.(Gwen likes berry's)

You need to give Gwen berry's every day for 4 weeks. You will also need to befriend Nic, Nak, and Flak (The Harvest Spirits)

Once she mentions the weasel it is farely simple just stick to what she says and keep on giving her food and presents.
By Brew's HarvestMoon Ps2 and 64