The Tower Of London: Reclaiming the Ravens

The guard has left me at the main gate. What should I do?
What am I trying to accomplish here?

Where can I find the first "raven"?
Where can I find the second "raven"?
Where can I find the third "raven"?
Where can I find the fourth "raven"?
Where can I find the fifth "raven"?
Where can I find the sixth "raven"?

How can I get access to the storeroom?
What is the combination for the lock in the storeroom?
Where can I find a reference on birds to help identify them?
How can I reach the hidden room in the crypt?

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