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From the point of view of taxonomy, hybrids vary consistent with their parentage. Hybrids between specific subspecies (which include between the Dog and Eurasian wolf) are called intra-unique hybrids. Interspecific hybrids are the offspring from interspecies mating; those on occasion result in hybrid speciation. Intergeneric hybrids result from matings between exceptional genera, together with among sheep and goats. Interfamilial hybrids, which includes among chickens and guineafowl or pheasants, are reliably defined however extraordinarily uncommon. Interordinal hybrids (among special orders) are few, but have been engineered between the ocean urchin Strongylocentrotus purpuratus (female) and the sand dollar Dendraster excentricus (male).