Dorsals on \Humpbacks are not particularly large but seem to have a lot of variation with regareds to shape. I am by no means an expert but two of these animals seem to have particularly droopy fins and if seen sepereately, could be easily confused as the same animal.
Tricky stuff this photo ID lark! although it seems that the main ID feature on Humpies is the pattern on the underside of the tail flukes.
Thanks for the pic's Verena!and happy birthday on Tuesday (which you also share with Cristina!) Happy birthday both!!!