Bear, lion, wolf: who is the most efficient predator on Earth?

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Recent research conducted at Deakin University in Australia has shed light on an interesting question: solitary predators such as tigers and brown bears kill more animals compared to social predators such as wolves and lions.
However, it is important to keep in mind that prey size plays a significant role in this process as well. A lone predator may catch a large deer that will provide it with calories much better than many smaller animals.