Songbird is being established as the Canary network for Flare. All the systems being deployed on Songbird are new and are being deployed to Songbird for testing so as to achieve greater robustness for the launch of Flare.
Flare Network is purpose-built for safely interpreting the state of all underlying chains. Other networks either force you to rely on trusted third parties for this, or they force other chains to conform to their standards, in effect changing the independent chain's protocol so they can then begin to communicate. Flare by contrast does not require you to trust anyone but the validators of an underlying chain, and Flare does not require validators from the underlying chains to even be aware that Flare exists.
