All camelids, have metatarsal glands, cleft lip, polygamous social organization, use of manure, no significant sexual dimorphism and ovulation induced with a single offspring per litter per year.
The 4 species have the same karyotype and can interbreed with each other and produce fertile hybrids.
They also have a productive life of about 14 years, being capable of reproduction at age 2.
They have 3 stomachs, two pairs of pads at the end of the second phalanx, and the last joint is covered with nails, pad, footpad, not damaging the soil by trampling.
The growth of the incisors is continuous, similar to rodents and have elliptical red blood cells, small and anucleares.
They are territorial especially the vicuna and the guanaco forming social groups classified as families, herds of males and lonely, they act in groups, being gregarious.
In situations of aggression flip ears back and lift the face and tail, especially the males during the mating season, they wallow in loose soil, sand or ash and shit on pre-established sites used as signs of territoriality among families.
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