Side by side

  

Two species of storm-petrels — Ashy Storm-Petrel (Oceanodroma homochroa) on the left and a Fork-tailed Storm-Petrel (Oceanodroma furcata) on the right. 

We didn't see many storm-petrels during the boat trip on 23 May 2021, but here's a fun silhouette view of two Fork-tailed Storm-Petrels:

 

 

If you're not familiar with them, storm-petrels are small seabirds.  These two species have a wingspan of ~16" — similar to that of an American Robin.