  We study packings of bidispersed spherical particles on a spherical surface.
The presence of curvature necessitates defects even for monodispersed
particles; bidispersity either leads to a more disordered packing for nearly
equal radii, or a higher fill fraction when the smaller particles are
accomodated in the interstices of the larger spheres. Variation in the packing
fraction is explained by a percolation transition, as chains of defects or
scars previously discovered in the monodispersed case grow and eventually
disconnect the neighbor graph.
