Vikas Rai, R. K. Upadhyay, S. N. Raw, Nitu Kumari Computational Ecology and Software ISSN 2220-721X 2011 1(3) 153-182 09/2011 International Academy of Ecology and Environmental Sciences prey interference prey toxicity extinction-persistence diseases in plant and animals dhealth of ecosystems human health We simulate the dynamical behavior of a few two - dimensional predator - prey systems in two - dimensional parameter spaces to gain insight into how functional responses affect community dynamics. The insight gained helps us design three dimensional systems. We construct models for a few ecosystems with three species and study them using computer simulations. The models have been developed by linking food chains which have both kinds of predators: specialist as well as generalist. The linking functions are weakly non-linear. The three dimensional model ecosystems have sexually reproducing top - predators. We perform extensive simulations to figure out dynamics of dynamical possibilities caused by changes in animal behavior. The animals change the foraging strategies and behave differently in different environments. At the end of the paper, we examine how diseases can govern transitions in meandering of dynamical models in bounded volume of their phase spaces. DOI 10.0000/issn-2220-721x-compuecol-2011-v1-0018 http://www.iaees.org/publications/journals/ces/articles/2011-1(3)/Some-aspects-of-animal-behavior-and-community-dynamics.pdf