Question: What is the distinctive characteristic of this African equid featured in Pearls Before Swine?

Context articles: Familiar Songs
Pearls Before Swine (comics)
PEPPADEP
Zosteraceae
Zebra
Yuty (crater)
Cowtail stingray
Paolo Antonio Testore
Marsupial
Pearls before swine

Familiar Songs was an album released on Reprise Records in 1972 by American singer-songwriter Tom Rapp, the leader of folk-rock group Pearls Before Swine.
 It was presented as his first solo album, although several previous albums credited to Pearls Before Swine had actually been recorded by Rapp with session musicians, rather than by a working group.
 The album is also sometimes known simply as Tom Rapp, because its title does not appear on the front sleeve.
Pearls Before Swine is an American comic strip written and illustrated by Stephan Pastis.
 It chronicles the daily lives of five anthropomorphic animals: a Pig, a Rat, a Zebra, a Goat, and a fraternity of crocodiles, as well as a number of supporting characters.
 Each character represents an aspect of Pastis' own personality and world view.
 The daily and Sunday comic strip is distributed by Universal Uclick (by United Media's United Feature Syndicate before 2011).
PEPPADEP is the acronym for Programme pour l’éradication de la peste porcine africaine et pour le développement de l'élevage porcin or the African Swine Fever Eradication and Swine Industry Development Project, a development project launched in 1981 by the Food and Agriculture Organization of the United Nations; the Interamericano Institute de Ciencias Agricola (IICA), a branch of the Organization of American States; the International Development Bank; the governments of Mexico, Canada, the United States; and the government of Haiti to "eliminate the debilitating effects of ASF African Swine Fever in Haiti and to begin development of a productive swine industry".
Zosteraceae (one of the four seagrasses families, Kubitzki ed.
 1998) is a family of marine perennial flowering plants found in temperate and subtropical coastal waters, with the highest diversity located around Korea and Japan.
 Most seagrasses complete their entire life cycle under water, having filamentous pollen especially adapted to dispersion in an aquatic environment and ribbon-like leaves that lack stomata.
 Seagrasses are herbaceous and have prominent creeping rhizomes.
 A distinctive characteristic of the family is the presence of characteristic retinacules, which are present in all species except members of "Zostera" subgenus "Zostera".
Zebras ( or ) are several species of African equids (horse family) united by their distinctive black and white striped coats.
 Their stripes come in different patterns, unique to each individual.
 They are generally social animals that live in small harems to large herds.
 Unlike their closest relatives, horses and donkeys, zebras have never been truly domesticated.
Yuty is a crater on Mars in Chryse Planitia, named after the town of Yuty in Paraguay.
 It measures approximately 19 km in diameter, and is surrounded by complex ejecta lobes, which are a distinctive characteristic of martian impact craters.
The cowtail stingray, "Pastinachus sephen", is a species of stingray in the family Dasyatidae, widespread in the Indo-Pacific region and occasionally entering freshwater habitats.
 Other common names include banana-tail ray, drab stingray, fantail ray, feathertail stingray, and frill tailed sting ray.
 This species is sometimes placed in the genus "Dasyatis" or "Hypolophus" (an obsolete synonym of "Pastinachus").
 The most distinctive characteristic of the cowtail stingray is the large, flag-like ventral fold on its tail, which is especially prominent when the ray is swimming.
 This species is targeted by commercial fisheries as a source of high-quality shagreen, a type of leather, and its populations are now under threat from heavy exploitation.
Paolo Antonio Testore (born 1700 - died 1767) was a Milanese luthier.
 He was born in Milan, the second son of Carlo Giuseppe Testore, also a noted luthier, and worked out of the family's workshop under the "Sign of the Eagle" on Contrada Larga in Milan.
 He was one of the three finest instrument-makers from the Testore family, but a distinctive characteristic of Paolo Antonio's work is that he often omitted purfling and sometimes used lower quality wood.
Marsupials are any members of the mammalian infraclass Marsupialia.
 All extant marsupials are endemic to Australasia and the Americas.
 A distinctive characteristic common to these species is that most of the young are carried in a pouch.
 Well-known marsupials include kangaroos, wallabies, koalas, possums, opossums, wombats, and Tasmanian devils.
"Pearls before swine" and "casting pearls" refer to a quotation from in Jesus's Sermon on the Mount: "Do not give what is holy to the dogs; nor cast your pearls before swine, lest they trample them under their feet, and turn and tear you in pieces."