For robins small worms contain 25 calories of
energy, cost 10 calories and take 2 minutes to harvest. For the same birds medium worms contain 50
calories and cost 15 calories and take 3 minutes to harvest. Large worms contain 75 calories, cost 30
calories and take 5 minutes to harvest.
Based on optimal foraging theory, what sized worms should robins
favor? Explain your logic!