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2. Equidae - Wikipedia

   en.wikipedia.org/wiki/Equidae

   Equidae (commonly known as the horse family) is the taxonomic family of horses and related animals, including the extant horses, asses, and zebras, and many other species known only from fossils. The family evolved more than 50 million years ago, in the Eocene epoch, from a small, multi-toed ungulate into larger, single-toed animals.

3. Equus (genus) - Wikipedia

   en.wikipedia.org/wiki/Equus_(genus)

   Equus (/ ˈ ɛ k w ə s, ˈ iː k w ə s /) [3] is a genus of mammals in the family Equidae, which includes horses, asses, and zebras.Within the Equidae, Equus is the only recognized extant genus, comprising seven living species.

4. Evolution of the horse - Wikipedia

   en.wikipedia.org/wiki/Evolution_of_the_horse

   The horse's evolutionary lineage became a common feature of biology textbooks, and the sequence of transitional fossils was assembled by the American Museum of Natural History into an exhibit that emphasized the gradual, "straight-line" evolution of the horse. Since then, as the number of equid fossils has increased, the actual evolutionary ...

5. Equinae - Wikipedia

   en.wikipedia.org/wiki/Equinae

   Equinae is a subfamily of the family Equidae, known from the Hemingfordian stage of the Early Miocene (16 million years ago) onwards. [1] [2] They originated in North America, before dispersing to every continent except Australia and Antarctica.

6. Protorohippus - Wikipedia

   en.wikipedia.org/wiki/Protorohippus

   Based on oxygen and carbon isotope analysis of the teeth of P. montanum, the species is believed to have had two distinct birth seasons per year, a result of the diminished seasonality during the Early Eocene. It is possible that this phenomenon held for other early equids as well.

7. Equine nutrition - Wikipedia

   en.wikipedia.org/wiki/Equine_nutrition

   Grass is a natural source of nutrition for a horse. Equine nutrition is the feeding of horses, ponies, mules, donkeys, and other equines. Correct and balanced nutrition is a critical component of proper horse care. Horses are non-ruminant herbivores of a type known as a "hindgut fermenter." Horses have only one stomach, as do humans.

8. Equid hybrid - Wikipedia

   en.wikipedia.org/wiki/Equid_hybrid

   Equid hybrids can be traced back to Africa where there are vast amount of equid species which resulted in natural crossing, creating hybrid species. These hybrids were found to be more efficient than the original species because they possess certain traits of both species, so scientists began to experiment by crossing other species of horse ...

9. Perissodactyla - Wikipedia

   en.wikipedia.org/wiki/Perissodactyla

   At the other extreme, an early member of the order, the prehistoric horse Eohippus, had a withers height of only 30 to 60 cm (12 to 24 in). [5] Apart from dwarf varieties of the domestic horse and donkey, living perissodactyls reach a body length of 180–420 cm (71–165 in) and a weight of 150 to 4,500 kg (330 to 9,920 lb). [6]