  Citizen Science aims to engage people in research activities on important
issues related to their well-being. Smart Cities aim to provide them with
services that improve the quality of their life. Both concepts have seen
significant growth in the last years, and can be further enhanced by combining
their purposes with IoT technologies that allow for dynamic and large-scale
communication and interaction. However, exciting and retaining the interest of
participants is a key factor for such initiatives. In this paper we suggest
that engagement in Citizen Science projects applied on Smart Cities
infrastructure can be enhanced through contextual and structural game elements
realized through augmented audio interactive mechanisms. Our inter-disciplinary
framework is described through the paradigm of a collaborative bird call
recognition game, in which users collect and submit audio data, which are then
classified and used for augmenting physical space with virtual soundscape maps.
We discuss the Playful Learning, Internet of Audio Things, and Bird Monitoring
principles that shaped the design of our paradigm, and analyze its potential
technical implementation.
