Final answer:
It is true that if humans had a metabolism like hummingbirds, they would need to ingest about 155,000 calories a day to sustain their metabolism, given the high energy requirements and ultra-fast digestion hummingbirds exhibit.
Step-by-step explanation:
Hummingbirds have extremely high metabolic rates to support their energetic lifestyle, which includes prolonged periods of flight. They must consume a significant amount of energy rapidly, which comes from their food. The fact that a hummingbird's metabolic rate is exponentially higher than that of larger animals, including humans, leads to the statement that if humans had a metabolic rate similar to hummingbirds, they would need to ingest about 155,000 calories per day. Given the context of the energy demands and efficiency of a hummingbird's flight muscles, as well as their rapid digestion and frequent feeding requirements to maintain energy, this statement could be seen as true. Additionally, hummingbirds have a four-chambered heart that beats very quickly to keep oxygenated blood flowing to their muscles, much faster than the human heart rate.