Franklin Gulls, California Gulls, Ring Billed Gulls, Herring Gulls
- Franklin Gulls: small (220-335g),
with black head.
- California Gulls: medium (430-1045g),
yellow bill with black ring near tip and a red spot on the lower mandible.
- One clutch a year, with 1-4 eggs.
- Young are Semi-precocial, stay in nest
for 3 weeks.
- Property damage from fecal matter: ruin paint on houses and vehicles.
- Contamination of recreational and drinking waters from fecal matter.
- Loafing on school and sport fields, contaminating it with fecal matter.