If you're talking about the tail key or whatever it was, here is how you do it.

From the start of the beginning of Legend Of Zelda Link’s Awakening, go left for two
screens. You will see the well that you can jump into, plus the brown path that is leading
north. Now go into the Mysterious Forest and go as far north as you can. Now take the path
towards the very top of the screen that is going to the east. Now go north for one screen
and you should see a huge tree with a raccoon. If you did some exploring when searching
for the Sleepy Mushroom, you might of ran into this guy before.

Don’t talk to the raccoon right now, he will curse you into an endless maze forest if
you talk to him. Take out your magic powder and sprinkle some on the raccoon. Now the
raccoon will magically change back into Tarin. Tarin was turned into an animal after he
ate a mushroom in the forest. Now that he is changed back to normal he won’t be able to
send you into an endless maze again. Now go one screen north and you’ll find what
you’re looking for. There is no need to do anything else on this screen but open the
treasure chest.

uh, did that help?

Keep pressing A or B (only one of them. I don't remember which one). That's what confused
me when I got there.

wait is eagle's tower the eigth dungeon or not

But isn't there a section where you can ask that? Actually I would doubt anyone would
answer you so I guess it was better to ask here.

srsly

What can I say? (nothing)

don't say a thing

is the concept of not saying one of your "witty" comments too hard to grasp

The Bird`s key.