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Blue-faced Booby 
( Sula dactylatra ) 
All sightings north of the equator are probably f rom Revilla- 
Gigedo nesting stations. One bird in the Southern Hemisphere 
represents the only booby observed in that area. 
An excellent example of the highly develoned behavior pattern 
which is so typical of the family Sulida was observed and is here 
recorded. While cruising along at our normal 10 knots a magnificent 
adult Blue-faced Booby happened to spot the David Starr Jordan. To 
satisfy its curiosity the beast changed course and flew over our ship 
to investigate this strange object which had entered its watery 
domain. In no time at all the bird realized that it could travel 
along motionless, utilizing the up-draft produced by the ship's bow. 
Everything was going fine until our great booby spotted a morsal of food, 
wheeled and dove. The bird returned to the surface with the fish in 
its bill just in time to see the David Starr Jordan run him over. 
Red-footed Booby 
(Sula sula ) 
All Red-foots observed were light phase, and therefore can 
be attributed to the Revilla-Gigedos Islands, Tres Marias, and 
Clipperton Islands. The adults of this race have dark tails making 
them difficult to distinguish from Blue-faced Boobies at a distance. 
Red-foots were the most abundant booby at sea, being replaced by 
Brown Boobies when close to shore. 
Brown Booby 
( Sula leucogaster brewsteri ) 
Brown Boobies are the most abundant booby along the coast, 
and only rarely wander out to sea. This sub-species is identified by 
the white headed males. 
Magnificent Frigatebird 
( Fregata magnificens ) 
The scarcity of frigatebird sightings due to this species 
preferring coastal waters, and the probability of this being their 
nesting season. There is no indication of Fregata minor being 
present, although it is known to occur in the area^ 
Red Phalarope 
( Phalaropus fulicarus ) 
This species was recorded in every section and on almost every 
day of the cruise. The largest concentrations were found along the 
coast in area "C"’. Almost every natural slick contained Phaiaropes 
and Storm Petrels as the two plankton feeding birds prefer to feed in 
calm waters. 
Phaiaropes appeared regularly on nocturnal stations, and could be 
identified by their call. 
