Environmental toxins have emerged as a major global concern due to their profound effects on animal physiology,biodiversity,andecosystem stability.Rapid industrialization, Agricultural intensification, urbanization, and improper waste disposal have increased the release of toxic substances such as heavy metals, pesti- -cides,plastics,pharmaceuticals,and industrial pollutants into natural environments. These contaminants accumulate in soil,water, and air, affecting organisms at multiple biological levels. The present study investigates the impact of environmental toxins on animal physiology and overall ecosystem health through a health through a comprehensive analytical and review based approach. The study focuses on key areas such as physiological toxicity, bioaccumulation, cumulation, endocrine disruption, ecological imbalance, and emerging toxic contaminants. Data have been collected from scientific literature, environmental monitoring reports, and international organizations. Findings indicate that environmental toxins significantly affect metabolic processes, reproduction, immune responses, behavior, and survival of animals, while also disrupting food webs, biodiversity, and ecosystem functioning. The study highlights the need for integrated toxicological research, pollution control measures, and sustainable environmental management to mitigate ecological risks associated with toxic contaminants.