cuniculi). Wry Neck, or head tilt, is when a rabbit's head starts to turn to the side. The rabbit will also lose it's balance and be very unstable. In later stages, the rabbit will walk in constant circles, to one side.
The living organisms that eat the producers are then considered to be the primary consumers, similarly to how the first person to buy a car is the primary consumer of that particular car. The primary consumers now have energy, and other organisms that are called secondary consumers can eat them. Secondary consumers are those organisms whose main food source is primary consumers. This is similar to you as the second consumer of the car. Even the secondary consumers have energy to pass on and can then be consumed by the tertiary consumer. These consumers are those who feed mostly on secondary consumers.
Third-level consumers are any organisms big enough to obtain energy by feeding off lower-level consumers. These are also called tertiary consumers. For example, in a forest ecosystem, snakes eat toads. Heron and large fish, such as bass and walleye, consume smaller fish, frogs and crayfish. Some ecosystems have four or more levels of consumers. Owls, high-level forest predators, go after third level consumers such as snakes and other smaller animals.