Final answer:
A bluebird is classified as a secondary consumer in a food web, as it feeds on insects and other small creatures.
Step-by-step explanation:
A bluebird is best classified as a secondary consumer. In an ecosystem, there are various trophic levels that organisms can occupy. These include primary consumers which feed on producers such as plants, secondary consumers which feed on primary consumers, and tertiary consumers which feed on secondary consumers. Bluebirds consume insects and other small creatures, placing them in the category of secondary consumers within the food web. In the trophic levels of an ecosystem, a bluebird would be classified as a tertiary consumer. Tertiary consumers are carnivores that eat other carnivores. In this case, the bluebird feeds on insects and small animals, making it a tertiary consumer in the food chain. Decomposers, on the other hand, break down dead organic material and are not part of this consumer classification.