April 24th, Saturday
A few tidbits for when you can't quite figure out who it is you saw.
The dorsal fin and saddle patch are the key identifiers of orcas. Most of the time they can be identified by one or both.
In addition there are nicks and notches (not included in here) some with tiny nicks and a few with notches, take Notch J-47 for example.
Below are additional things to look for that might help you when looking at your images. scratches on the body; highlighting an image to see a blemish more clearly; the mouth line is sometimes unusual, and the eye patch, to name a few.