Observer: A Solitary eagle (Buteogallus solitarius) was observed flying slightly outside its natural range (usually observed west of Sinaloa). This sighting was made in the shores of Mazatlán (eastern side of this state).
Consult: There is very little information available regarding the current distribution of the solitary eagle in the state of Sinaloa (and in Mexico in general), although it is considered a very local species northwest of Mexico and very rare along its natural range (Bierregaard, 1994). Based on the maps of historical (Fig. 1) and potential distribution (Fig. 2), you can see that the southeast of Sinaloa is part of the solitary eagle's range. So it's possible that this species inhabits an area near Mazatlán, but has not been observed or recorded recently in that site. In fact, the coasts are not the type of habitat in which they are often found. These eagles prefer wooded mountain slopes, and cloud forests (add reference), so the specimen sighted on the coasts of Mazatlán may well be a juvenile, as in most birds of prey it is common for the inexperienced juveniles to explore new territories (add reference).
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