În 2015, s-a observat că măgarii și caii sălbatici sapă "fântâni” în deșertul Arizona. Zeci de specii au profitat de ochiurile de apă

A study in Arizona reveals that wild horses and donkeys create water holes in dry riverbeds, benefiting various animal species during droughts. These holes can provide up to 74% of surface water in some areas and have been used by 57 vertebrate species, including birds and bears. The research highlights the dual role of these animals as both potential invaders and ecosystem engineers, as they help sustain wildlife in arid environments. However, the impact of wild equines varies by region, necessitating careful consideration of their management.