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Find all private keys and dump their fingerprints.
This is the best way to fix this issue on OS X. If you don't have homebrew installed, now is the perfect time to fix that too. ;-)
Works for multiple hosts (such as www.google.com) and/or wrong hosts.
Quick shortcut if you know the hostname and want to save yourself one step for looking up the IP address separately.
Some servers don't have ssh-copy-id, this works in those cases.
It will ask for the destination server, this can be IP, hostname, or user@hostname if different from current user.
Ssh keygen will let you know if a pubkey already exists on your system and you can opt to not overwrite it.