Working with various groups within CENS, we are developing, testing, and will be soon using acoustic sensor arrays to identify, track, and study the social interactions of various bird species. There has been good technical progress towards this goal, especially in the localization and recognition areas. We are currently collecting data and testing prototype systems at three sites, the James Reserve and the Hastings Reserve in California, and the Montes Azules Biopshere Reserve in Chiapas Mexico.