1. English and Scientific names: Brown Booby, Sula leucogaster


2. Number of individuals, sexes, ages, general plumage (e.g., 2 in alternate plumage):

1 adult


3. Locality: Parish:   Plaquemines Parish

   Specific Locality: Mississippi River just upstream of Pilotown.


4. Date(s) when observed: 8-31-13

5. Time(s) of day when observed: Approx. 0700 h.

6. Reporting observer and address: David P. Muth, 2765 Orchid St., New Orleans, LA 70119.

7. Other observers accompanying reporter who also identified the bird(s): Eric Johnson, Phillip Wallace, Dan O’Malley et al.

8. Other observers who independently identified the bird(s):

9. Light conditions (position of bird in relation to shade and to direction and amount of light): Bird was east of us flying north rapidly up the channel. Light went from execrable to barely tolerable as it got north of the boat.

10. Optical equipment (type, power, condition): Eagle Optics Platinum 10x42.

11. Distance to bird(s): Maybe 100 yards when abeam.

12. Duration of observation: Less than one minute.

13. Habitat: Mississippi River

14. Behavior of bird / circumstances of observation (flying, feeding, resting; include and stress habits used in identification; relate events surrounding observation): flying on a mission

15. Description (include only what was actually seen, not what "should" have been seen; include if possible: total length/relative size compared to other familiar species, body bulk, shape, proportions, bill, eye, leg, and plumage characteristics. Stress features that separate it from similar species):


An obvious Sulid; initial assumption in my mind that it was a gannet gave way to realization that it might be booby as I discerned the pattern and as commentary mounted. Dark head and throat, sharp line of demarcation between throat and white breast, dark upperwings, underwing dark with light axillars and wing linings (might have only seen this in photos). Bill pale, contrasting with dark head, long and conical with sharp tip

16. Voice: not heard.

17. Similar species (include how they were eliminated by your observation): I was not really certain about ID during observation, though the clean pattern and sharp contrasts suggested an adult not a juvenile MABO, RFBO, or NOGA. But when I saw the photos on the digital screens that had been obtained by fellow boat riders, the bird’s overall color and patterns could be more clearly seen and it was clearly a Brown Booby adult.

18. Photographs or tape recordings obtained? (by whom? attached?): Several others, including O’Malley, Johnson and Wallace.

19. Previous experience with this species: One in Louisiana, several in Florida, Mexico, Belize, Honduras, and Costa Rica.

20. Identification aids: (list books, illustrations, other birders, etc. used in identification):

a. at time of observation: none

b. after observation: Sibley, etc.

21. This description is written from: _____ notes made during the observation (_____notes attached?);_____notes made after the observation (date:_____); xx memory.

22. Are you positive of your identification if not, explain: Yes.

23. Date: 03-07-14 Time: what difference does that make?

24. May the LBRC have permission to display this report or
portions of this report on its website?

If yes, may we include your name with the report? yes