Complex sentence: Estimates put bumblebee metabolic rate at extremes surpassing even hummingbird metabolic rates, so efficient foraging and good decision-making is paramount or the workers risk a net loss of energy.
Split into simpler sentences: Estimates put bumblebee metabolic rate at extremes surpassing even hummingbird metabolic rates. For that reason, efficient foraging and good decision making is paramount or the workers risk a net loss of energy.