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This paper describes the birds' structure and composition of associated sites to tropical forest in the Central Depression of Chiapas, Mexico, through 2003 to 2004. I recorded 364 species considering scientific literature, museum collections and field work. Families with highest species richness were Tyrannidae, Parulidae, Icteridae and Trochilidae. Resident birds represented 68% of the total and the 32% remaining were migratory. Thirty four percent of bird species were rare, 11% common and 3% abundant. Highest species richness was found for the tropical deciduous forest (226), followed by the secondary forest (163) and the tropical semideciduous forest (122). From all birds, 136 were additional records in the region and, 56 were for the Sumidero Canyon National Park. The species richness recorded included 45% of the avifauna of Chiapas, indicating the relevance of this region and the urgent need to establish conservation and protection management strategies. The magnitude of species increment and lack of information in this region suggest that regional and local inventories are necessaries to improve the knowledge about species distribution. [ABSTRACT FROM AUTHOR]

The aim of the present paper is to compare the morphology of Eustachian Tube (ET) in guinea pigs, domestic birds and frogs, with the purpose of analyzing the morphological differences among mammals, birds and batrachians. For the study 30 heads were used (10 for species) of the animals before mentioned. It was found that in these three species the TE is adapted to the habitat, in the case of the guinea pigs the torus tubarios is in the nasopharynx, in the birds is a torus tubarios (to bifurcate in toward the half hearing) in the roof of the oral cavity and in the frogs this in the lateral portion of the oropharynx and this permanently open one. The ET differs in size and it forms in the different species. [ABSTRACT FROM AUTHOR]

This paper reports the richness of bird species in the northeastern region of the Sierra Nevada mountains, Mexico, from August to November 2001 and from February to June 2002. A total of 104 species representing 34 families and 11 orders were recorded, of wish 88 were resident and 16 were migrants. Forty percent of the species were abundant, 22% scarce, and 38% rare. The richest families were Parulidae (13 species), Emberizidae (11) and Turdidae (9). Sixty-five species were considered core and 39 vagrant. This study adds 43 species to the inventory for this region of the state of Mexico. [ABSTRACT FROM AUTHOR]