Wallace's Giant Bee, also known as the 'flying bulldog,' is the world's largest bee, measuring up to 1.5 inches with a 2.5-inch wingspan. Rediscovered in 2019 after vanishing for decades, this solitary bee nests in termite mounds in Indonesia's lowland forests. Its imposing size, muscular build, and large mandibles contribute to its intimidating nickname, making it a remarkable find for entomologists and conservationists.