Una vocalización del Pijuí Común de Cola Parda, Synallaxis albescens (Aves, Furnariidae), es similar al sonido mecánico de advertencia de la Víbora de Cascabel, Crotalus durissus terrificus (Serpentes, Crotalidae)

Roberto Straneck


: A vocalization of the Pale-breasted Spinetail, Synallaxis albescens (Aves, Furnariidae) is similar to the mechanical warning sound of the Rattlesnake, Crotalus durissus terrificus, (Serpentes, Crotalidae). The "begging call" vocalization of the juveniles of the Pale-breasted Spinetail (Synallaxis albescens), is similar to the mechanical sound of "warning" of the rattlesnake (Crotalus durissus terrificus). The similarity of both sounds, in frequency, amplitude, and rythm, is so close that herein it is proposed that this vocalization protects the juveniles from possible predators. One additional aspect that suggests this protection is that the nests of this species, at least in Argentina, are usually constructed near the ground (0.40-2.50 m) on bushes of easy access for predators, in spite of which, this species is very common in this region. Distributional maps of both species in South America, overlap in at least 80% and so, the possible predators of the bird would know the "warning" sound of the snake. This similarity is proposed herein as a possible case of batesian mimicry.  

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