This book is consists of seven chapters. First chapter is introductory in nature and in the remaining chapters different type of interactions discussed in detailed. 2nd Chapter describes the Stability Analysis of a Three Species Syn-Eco Dynamical System with a Limited Alternative Food for all the Three Species. 3rd Chapter gives detailed insight on Mathematical Study of an Ammensalism Model with Two Neutral Species on the Third. 4th Chapter deals with A Three Species Ecological Model with Ammensalism and Neutralism. 5th Chapter explains the Stability Analysis of Three Species Ammensalism Model in which the species first kind harms the species of second kind, the species of second kind harms the species of third kind and species of third kind harms the species of first kind. 6th Chapter is devoted to A Mathematical Study of Humans Ammensal Relationship with Plants and Birds. 7th chapter analyses the Stability Analysis of Three species Syn-Ecological Model with Prey-Predation and Ammensalism.