. Bulletin of the British Ornithologists' Club. Vol. 85 16 Bulletin Potential food fish in Lake Atitlan are: *Cichlasoma nigrofasciatum=zebra-backed cichlid Cichlasoma species of mojarras Tilapia mossambica=ti\apia. MoUienisia sphenops=pescadito Profundulus gw#/m7tf/6m/5=gulmina=characin Astyanax Poecilistes sp. = pupo=top minnow *one record exists of this fish found inside a grebe. When a bird catches a fish, it immediately looks around and swims for deeper water. This seems to be a safeguard against food-snatching, a common practice among mates and juvenile
. Bulletin of the British Ornithologists' Club. Vol. 85 16 Bulletin Potential food fish in Lake Atitlan are: *Cichlasoma nigrofasciatum=zebra-backed cichlid Cichlasoma species of mojarras Tilapia mossambica=ti\apia. MoUienisia sphenops=pescadito Profundulus gw#/m7tf/6m/5=gulmina=characin Astyanax Poecilistes sp. = pupo=top minnow *one record exists of this fish found inside a grebe. When a bird catches a fish, it immediately looks around and swims for deeper water. This seems to be a safeguard against food-snatching, a common practice among mates and juveniles. We also observed a young grebe pecking at Typha stalks where aphids and dried-up helgrammite cases were attached. Other possible food items could include dragonflies and other insects, leeches, water spiders and crabs {Potomocarcinus guatemaJensis). No pellet casting was noted in wild or captive birds. Non-reproductive behaviour A special effort was made to determine whether the grebes are capable of flight. During a total of 150 hours observation, we saw birds run across the water, flapping their wings violently, but never becoming airborne. We named this "Patter-flight". Upon dissection of the pectoral muscles, it was found that P. major was well-developed while P. minor was small. The ratio averaged 8:1 in grams. Adult grebes weigh between 500 to 900 grams usually, yet their wings are small. The total wing area of an 805 gram male was 414 sq. cm. The author concluded on the basis of field observations plus laboratory data that Giant Grebes are not normally capable of flight. Against a strong wind, it is possible that a bird might briefly fly. The species swims and dives with ease. The farthest distance covered underwater was 100 meters. Females showed a tendency to submerge sooner than males when alarmed. Excellent control of their specific. Male Giant Pied-billed Grebe giving territorial Please note that these images are extracted from scanned page image
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