Recently, many websites were hacked or compromised because of the weak authentication logic used in them. Google/Twitter are now using 2FA to take care of such cases. New iPhone 5S has a fingerprint scanner for authentication purposes. We humans can do this and develop more security and their implementations around such problems.
Now, what about birds - How do they set and use any password? Following article shows you how birds use their password or coded scheme in their chirping to ask for or set a password scheme:
http://blogs.discovermagazine.com/notrocketscience/2012/11/08/fairy-wrens-teach-secret-passwords-to-their-unborn-chicks-to-tell-them-apart-from-cuckoo-impostors/#.UkFKhoYmtfS
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