Request what she believes they might be running out of and she suggests that you visit Larry the Zookeeper relating to it. Go to Larry in Ardougne Zoo and ask about the birds. Larry says that RS gold he does not know a lot about bird behavior, other than penguins, and indicates that you visit his great friend, who happens to be a bird expert.
He will provide you a map to his friend's home, which can be in Varrock, near the general store. Ask about the birds and Ronald claims that if they are going South, then you need to follow them. Ask him the way to know where the birds are moving and he proposes checking the ground for shadows.
Step outdoors and in the city square are a few shadows. Follow them and they will direct you to the timber yard. They'll go into the back, where there's a fence you are able to leap over. Continue to follow along until you get to a river. There is a ruined raft near the water. Use two normal planks onto it, one at a time, and then use your hammer . Make certain that you have 10 steel nails with you. Now push the raft to the water and get onto it. It'll take you safely through the river where you can continue to follow the birds. Follow them directly until you reach a cave that the birds are flying into.
Light a candle and then head inside the cave. Walk right for a bit and you will get into a little river. Use your rope on the branch overhead and Cheap OSRS gold then swing across it on the other hand. It's an easy battle, so after its dead take its feathers.