which animal is NOT a first-level consumer
Deer
Bird
Caterpillar
Mouse
The short answer is, "NO". they are considered 2nd level consumers. First level consumers are animals such as Mice, who feed on plants, plant-based, etc.. Since a Rattlesnake would eat a mouse, it would be considered 2nd level. An example of a 3rd level consumer would be a hawk, or some other bird of prey, eating the snake.
Primary Consumer
Do you mean primary consumer? They may eat rodents, insects, plants etc. Let me give you an example Cabbage ---> slug -----> Bird (Producer) (Primary Consumer) (Secondary Consumer)
A pheasant is a first order consumer its, a Bird that eats plants.
Despite the berries inside the mouse, the eagle is still a carnivore (a bird of prey).
third-level consumer.
consumer
Grass (Producer) -> Grasshopper (Primary consumer) -> Frog (Secondary consumer) -> Snake (Tertiary consumer) -> Hawk (Quaternary consumer)
I think that a bird would be a consumer
I think that a bird would be a consumer
Secondary Consumer
A food chain for a wildcat might start with grass as the producer. Then a mouse would be the primary consumer that eats the grass. The wildcat, as a secondary consumer, would then prey on the mouse for food.