Sandgrouse and true Grouse are not at all closely related as Grouse belong to the Order Galliformes and superficial similarities with the true Grouse are the result of Convergent evolution.
Sandgrouse and true Grouse are not at all closely related as Grouse belong to the Order Galliformes while Sandgrouse are Pteroclidiformes. Superficial similarities with the true Grouse are the result of Convergent evolution.