They look like what is called spice finch on the guide here, but
my book on PR birds by Oberle called them nutmeg Mannikin, ( Lonchura punctulata ) or in Spanish, " Pinzon Acanelado" while also called the scaly breasted Mannikin, ...
Native to Asia, introduced here I guess...






I saw them Eating the same grss seeds that my house birds love so much.