Assertion: burro's horse | /r/RelatedTo | stenoid horses
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Source sentences:
text: 3 Initially rare in North America, caballoid horses were associated with stenoid horses (perhaps ancestral forerunners but certainly distinct species), but between one million and 500,000 years ago, the caballoid horses replaced the stenoid horses because of climatic preferences and changes in ecological niches (Forstén 1988).