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We study the linear stability of flock and mill ring solutions of twoindividual based models for biological swarming. The individuals interact via anonlocal interaction potential that is repulsive in the short range andattractive in the long range. We relate the instability of the flock rings withthe instability of the ring solution of the first order model. We observe thatrepulsive-attractive interactions lead to new configurations for the flockrings such as clustering and fattening formation. Finally, we numericallyexplore mill patterns arising from this kind of interactions together with theasymptotic speed of the system.

Stability Analysis of Flock and Mill rings for 2nd Order Models in Swarming