To find the type and the average number of specimens (e.g., 400 butterflies not 400 butterfly species) that a single tree can support. Alternatively, find the type and the average number of specimens in terms of CO2 offset (i.e., how much can planting a single tree offset CO2 emissions). Exclude complementary information such as how many pounds of CO2 a tree offset or the number of bacteria or fungus and focus only on animals and/or insects. This information will be used in a CO2 offset calculator indicating that if a person spends $35 on their gas bill, by offsetting their gas, they could have saved 300 birds, 60,000 caterpillars, and 10,000 butterflies, etc.