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Animal hybrids — the (17) .......... of two distinct species — are considerably more prevalent in nature than most people appreciate. The mule, produced by crossing a female horse with a male donkey, is perhaps the most familiar example. Mules are highly regarded for their endurance and remarkable (18) .......... .
Although mules are famously incapable of reproduction, it is a misconception that all hybrids are (19) .......... . Certain hybrid populations are cultivated on a large scale, frequently for agricultural purposes. One commercially significant outcome of deliberate (20) .......... is the beefalo — a cross between domestic cattle and wild buffalo — raised specifically for beef production.
Hybridisation in the wild can also confer distinct advantages. While some hybrids display (21) .......... traits that fall midway between those of their parent species, others exhibit unexpected strengths that enhance their ability to evade predators or adapt to environmental change.
Certain hybrids exist only in (22) .......... , given that the parent species would never encounter one another in the wild. The liger — a cross between a lion and a tiger — is the largest known feline, with one individual recorded (23) .......... in at a remarkable 418 kilograms.
Many hybrids eventually establish themselves as distinct species in their own right. (24) .......... frequently document so-called hybrid swarms, in which hybrid and purebred individuals are so thoroughly interbred as to be indistinguishable.