The Integration and Validation of Avian Radars (IVAR) SERDP project identified a set of functions a modern avian radar system should be capable of performing. It also developed specifications for the level at which these functions are expected to perform with existing commercial-off-the-shelf (COTS) technology. The functions and specifications are presented in this document, with the goal of using them as a starting point for anyone interested in acquiring and deploying avian radar technology.