Please take a look at the video lessons on The Scientific Way of Thinking to understand how VERA supports scientific modeling.

Sheep and Wolf and Grass (Stable)

This is a simplified model of a predator and prey cycling between the wolf (Canis lupus) and sheep populations (Ovis aires). The grass population also cycles within these two populations as well.

In the ecosystem, the domestic sheep are increase in population due to the availability of grass. Then the wolf population increases with the increasing prey, domestic sheep population. The increase in wolves then drives down the domestic sheep population and then the wolf population decreases due to decreasing availability of prey. After this occurs, the sheep population increases because their are less predators and the cycling starts again.

In VERA, increase the consumption efficiency of the wolf population to be greater than the consumption efficiency of the sheep population. But since grass is usually more available in an ecosystem, make the interaction probability between domestic sheep and grass to be high (closer to 100%). Also be sure to make sure the parameters for lifespan, reproductive maturity, and reproductive interval of sheep are close to the encyclopedia of life values. You should decrease the reproductive interval and maturity for grass.

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