ABSTRACT On at least six occasions since the late 1980s, dark-morph Western Reef Egrets Egretta gularis of the nominate subspecies gularis have been observed during the breeding season at L'Albufera de Valencia, in eastern Spain.Three instances of breeding by mixed pairs of this species and Little Egret E. garzetta were recorded, in 1988, 1989 and 1990. In addition, apparent hybrids, with pale grey

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