As global scientific understanding grows, most people now have a basic grasp of what defines a species. They recognize that distinct animals or plants belong to separate species. However, the creation of subspecies through breeding can complicate things. For instance, the common potato and sweet potato are entirely unrelated, but remarkably, the dachshund, Great Dane, and old English sheepdog all belong to the same species. Here are ten species that display astonishingly diverse members.
10. Brassica oleracea

Brassica oleracea is a species of leafy vegetable known in various forms. It has been selectively bred into numerous subspecies, each with unique characteristics and flavors. Imagine having a meal with steamed broccoli, baked cauliflower, crispy kale, cabbage, and Brussels sprouts. Despite their differences in appearance and taste, they all stem from Brassica oleracea. Broccoli is cultivated to emphasize its florets, while cabbage is grown for its leafy structure. Brussels sprouts are essentially mini cabbages, and cauliflower is a paler variant of broccoli. Kale is simply a form of cabbage with outward-growing leaves instead of forming a head. Despite the vast differences in shape, color, and flavor, they all belong to the same species.
9. Brassica rapa

In Europe, turnips are a staple vegetable commonly seen on dinner tables, while in Asia, boo chou and its various forms are enjoyed. Surprisingly, both are derived from the same plant. In the West, Brassica rapa was selectively bred to enhance its large root, which is consumed as a turnip. Meanwhile, in the East, the very same plant was cultivated for its leaves, leaving the root small and largely inedible. Essentially, each region consumes a different part of the plant. Further breeds and subspecies of Brassica rapa include broccoletti, Japanese mustard, and a wide variety of boo chou types such as bak choi, chou sum, Napa cabbage, wombok, pechay, Pekinesis cabbage, and many others. While these vegetables may vary greatly in appearance and flavor, they all stem from the same species.
8. Capsicum annuum

Sweet peppers, or capsicums, come in a variety of colors such as red, green, yellow, orange, white, and even purple, each offering a slightly different taste. Interestingly, many of these are simply different ripeness stages of the same plant. The fruit begins green, turns yellow, and eventually ripens to red. White capsicums are lighter variants, while purple capsicums are specifically bred for their vibrant color, but they all belong to the same species, Capsicum annuum. Even more surprisingly, a variety of hot chili peppers are also the same species as these mild, sweet peppers. Though the flavors and appearances differ, it is fascinating to realize they all come from the same plant. The word 'paprika' in both German and Hebrew refers to capsicum, which in English refers to the spice made by drying and grinding Capsicum annuum, even though it tastes quite different. All these varieties—sweet, spicy, and even the spice—belong to one species.
7. Cucurbita pepo

Zucchinis are a type of squash with soft, white flesh and a mild, buttery taste, with just a touch of bitterness when cooked. Pumpkins, in contrast, come in colors ranging from orange to yellow to green, or even white, with much denser flesh, larger seeds, and a taste that differs greatly from zucchini. Although there are several species of edible pumpkin, one of the most common is Cucurbita pepo. Surprisingly, zucchini also belongs to the same species. In fact, a number of other vegetables, such as the delicately striped squash, pattypan squash, and the large spaghetti squash, are all part of Cucurbita pepo. Despite their differences in size, shape, color, and taste, all these vegetables are from the same species. While these varieties can be crossbred, the resulting hybrids usually lack the distinct flavors of the original breeds. The extensive breeding of Cucurbita pepo has led to an impressive diversity in vegetables within this single species.
6. Camellia sinensis

Tea enthusiasts around the world have developed a variety of personal preferences. While fruit and herb teas are generally made from plant fruits, a significant number of teas are made from more traditional leaves. These include black tea, green tea, oolong tea, white tea, and yellow tea, each offering its own unique aroma and flavor. However, they all originate from the leaves of the same plant. The leaves of Camellia sinensis are dried and processed to transform them from vibrant green living photosynthetic engines into the small curled fragments we steep in hot water. The differences in taste arise from their processing methods, which determine the extent of oxidation. Green and white teas undergo the least oxidation, followed by oolong teas, and finally black teas, which are the most oxidized, resulting in a broad spectrum of tastes and health benefits.
5. Agaricus bisporus

Mushrooms are a delicious and versatile food. At the grocery store, you’ll often find small, round white button mushrooms or large, flat, brown portobello mushrooms. Some other popular varieties, though more expensive, include the tiny French champignon, Swiss brown, Roman brown, and Italian mushrooms. Surprisingly, they all belong to the same species, Agaricus bisporus, the most widely consumed mushroom species in the world. Rather than being separate subspecies, these mushrooms are simply different stages of growth. The fungus begins as small, pale buds and gradually enlarges, flattens, and darkens in color. The name it’s given depends on when it’s harvested. Although there are different strains of Agaricus bisporus, these variations are rarely noticed by consumers, as the changes in size and color due to maturation are enough to distinguish them.
4. Canis lupus

There are various types of wolves found across the globe, including the gray wolf, Eurasian wolf, Arabian wolf, and red wolf. However, these are not separate species; they are merely subspecies of Canis lupus. Dingos are a unique case of wolves that evolved separately, but the domestic dog is another example. Despite the incredible diversity in dog breeds, each one, no matter how different it appears in size or shape, is the same species as the wolf. Domesticated from wild wolves thousands of years ago, dogs have since been selectively bred for a variety of purposes—whether to herd, hunt, guard, or even catch fish. Some breeds, unfortunately, have been bred to the point of suffering from genetic issues caused by inbreeding. Remarkably, no other mammal has been bred into such a vast array of forms as the domestic dog. Still, from the tiniest chihuahua to the largest wolfhound, they all share the same species: Canis lupus.
3. Black Panther

The black panther stands out from other wild cats due to the fact that it actually belongs to several species, not just one. While a panther is often described as a fierce, large cat, it’s not a unique species on its own. Instead, panthers are large cats that carry the gene for melanism, resulting in black fur. Leopards (Panthera pardus), jaguars (Panthera onca), and possibly even cougars (Puma concolor) can all be born with this black fur, and are referred to as panthers. For example, a jaguar with typical coloration can produce cubs, some of whom may inherit the black fur and be labeled as panthers. These panthers, whether leopards or jaguars, still carry spots, though they are hard to spot due to the darkness of their fur. There have been rumors of black tigers, but only one verified instance of a black tiger has been recorded, a cub born in an Indian zoo that was initially white but turned black over time.
2. Equus ferus

Feral horses, commonly known as mustangs or brumbies, may seem like a distinct species from domestic horses, but this difference is purely behavioral. They are the same species, Equus ferus, and actually descended from domesticated horses. The only true wild horse species left is the Mongolian wild horse, or Przewalski’s horse, which is a separate subspecies. Just as domestic dogs have been selectively bred into various forms, so too have domestic horses. Some breeds, such as draft horses, are large and sturdy, with thick tufts of hair around their hooves, prized for their strength and endurance as workhorses. Others, like miniature horses, have been bred for their compact size and gentle nature. Miniature horses are now being used as assistance animals, functioning similarly to guide dogs, and they live longer than most other horses or dogs. They are especially beneficial to those who are allergic to dog fur.
1. Ursus arctos

Bears are the largest land predators, capable of adapting to various environments and diets as omnivores. Their sheer size and strength inspire fear in many who cross their path in the wild, and for good reason. Among the largest of these is the Kodiak bear, though the grizzly bear often garners more fame for its ferocity. Other notable members of the bear family include the brown bear, the American black bear, and the elusive Tibetan blue bear, all classified under Ursus arctos. The name Ursus arctos is derived from Latin and Greek, with ‘arctos’ meaning bear, and it’s the root of the word ‘arctic,’ referring to the northern bear constellation, Ursa Major. Ursus arctos includes a wide range of subspecies that differ vastly in size, weight, and coat color, with fur that may be long or short, shaggy or smooth, and in shades of brown, black, tan, or even a bluish tint. The sheer variety of these bears has left scientists uncertain about the exact number of subspecies within Ursus arctos.
