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M16979 is a specialized tour operator. Knut Eisermann and Claudia Avendaño are experts on the birds of Guatemala and professional bird guides. They are authors of the Annotated Checklist of the Birds of Guatemala (Lynx Edicions, Barcelona, 2007) and numerous other contributions to the ornithology of Central America. They have supported the development of birding lodges and local birding guides throughout Guatemala since more than 20 years.