The chapters incorporated in the present Volume 5 of the book series Animal Diversity, Natural History and Conservation represents an extremely modest selection of several facts on the subject. The lead articles includes: • Community Ecology and Taxonomy of Polychaetes in a Tropical Estuary • Distribution of Nymphalid Butterflies (Lepidoptera: Nymphalidae) at Different Altitudinal Habitats • A Taxonomic Review of the Genus Cyrtolabulus Van der Vecht, 1969 • Web Dynamics and Estimation of Capture Area of the Common Signature Spider, Argiope pulchella Thorell • Morphology of...