Hello Hugh,
Sorry for my delay in getting back to you. Been out in the woods. 
So, to solve this, you could attach a screen shot of your Sightings Entry Setup window (instructions in the Support FAQ), or I can ask some possible questions here.
In your Sightings Entry Setup window,
- have you selected more than one tax list?
- what location have you specified in the location field?
Try this. In your Sightings Entry Setup window
- Click the RESET button - this clears all settings
- Select only the ABA-2006 tax list
- Enter North America into your Location field
- Click CONTINUE
Now you should see the Herring Gull. Yellow-Legged Herring Gull should not show up with any default settings in BD, unless you possibly have the old Wells tax list selected also.
Let me know
Jeff |