Food chains, also called food webs, food networks and/or trophic networks, describe the feeding relationships between species to another within an ecosystem. Organisms are connected to the organisms they consume by arrows representing the direction of biomass transfer. Typically a food chain or food web refers to a graph where only connections are recorded, and a food network or ecosystem network refers to a network where the connections are given weights representing the quantity of nutrients or energy being transferred.

Scientists fear the largest mass extinction since the disappearance of the dinosaurs because of a deadly virus which is sweeping through populations of frogs, toads, newts, salamanders and caecilians across the globe. They play an important role in the food web as both predator and prey, eating insects which benefits agriculture and

Our food web has gotten so complex that many of our foods come from foreign countries. These brave people took on eating only local foods.

Bio150: Biomagnification & The Food Web, University of Toronto lecture notes

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