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MENDONÇA, M. A. C. Spermatic profile of captive Giant Anteater (Myrmecophaga tridactyla Linnaeus, 1758). [Análise descritiva do perfil espermático do tamanduá-bandeira (Myrmecophaga tridactyla Linnaeus, 1758) de cativeiro]. 2010. 86 f. Dissertação (Mestrado em Ciências) – Faculdade de Medicina Veterinária e Zootenia, Universidade de São Paulo, São Paulo, 2010. The purpose of the present study was to describe the physical, chemical, morphological, and functional features of semen collected from Giant Anteaters (Myrmecophaga tridactyla) raised in captivity—a first step toward the feasibility of assisted reproduction techniques and germplasm banks for this species in the midterm future. Electroejaculation, a method currently applied to a number of wild and domestic species, was performed in 13 animals housed in zoos located in the state of São Paulo, Brazil, yielding 11 samples from 9 animals (69.23%). The following mean values were obtained: volume, 1.30 ± 0.58 mL; motility, 33.18 ± 20.14%; vigor, 2.30 ± 0.65; concentration, 129.41 ± 114.3 x 10 cm; pH, 7.44 ± 0.60. Major and minor defects accounted for 53.77 ± 33.22% and 10.75 ± 6.23% of the total, respectively (mean total defect rate, 64.53 ± 19.97%). Damage was found in 16.3 ± 9.3% of acrosomal membranes and 18.9 ± 12.2% of plasma membranes. Mitochondrial activity, categorized as Classes I through V, was 66.4 ± 19.0%, 18.7 ± 9.1%, 8.0 ± 6.3%, 3.9 ± 3.1%, and 3.0 ± 2.9%, respectively. Chromatin fragmentation rate was 13.21 ± 9.13%. Conclusion: The study demonstrated the feasibility of applying electroejaculation to Giant Anteaters for semen collection, allowing for a detailed description of semen features previously unreported for this species. The large variation found in the results reflects differences in management conditions, age range, and possibly the small number of sampled animals, thus warranting further studies with free-ranging specimens.