I stood up to 85 cm tall and weighed 5 kg.
I was black and white and both males and females looked similar in appearance. I liked to eat fish and moved better in the water than on land.
I had a bill, short wings and laid eggs. I lived in many countries with few natural predators but was hunted to extinction by humans in the mid 19th century.
I have appeared in novels, childrens books, short stories and poems as well as paintings and a postage stamp.
I am the........???
The cache can be found at 41 0A.BCD 174 QR.STU
A) Appeared on a stamp issued in yyyy (3rd digit minus 1st digit)
B) Last pair were killed in what year? (4th digit minus 3rd digit)
C) Life span ? to ? years (sum of the first number)
D) A person was found buried with more than ? beaks (first digit)
Q) In yyyy I received my first official protection (third digit)
R) Wings were approximately ? cm long (first digit)
S) Scientific name (1st word minus 2nd word)
T) First name of the narrator less the first name of the dancer that was (who I am) in the ballet that was the subject of (who I am).
U) How many eggs were normally laid each year?
To confirm your thoughts, you're welcome to click here. Check your solution There is also some additional information which maybe useful.
You will need to bring your own pen. We hope you have enjoyed this cache. 
If you're also interested, check out the companion series of caches
Who am I? #1,
Who am I? #2,
Who am I? #3,
Who am I? #4
As usual, the physical log needs to be signed before you can claim your 'smilie'. Appreciated if you would refrain from giving away any hints of "Who I am" and of the location I'm hidden in, in your log. Also no photo's please of the location. Have fun!