These photos are of the sub-species found in eastern Brazil, C. h. affinis, which is less glossy and has a smaller patch of red on the rump than the nominate sub-species. Adult birds have sky blue irises as in photo 3 while younger birds have darker eyes.

They nest colonially but not necessarily close to wasp nests as is the case with Yellow-rumped Cacique. Compared with these, the nests of the Red-rumped Cacique are shorter and bulkier as you can see in photos 6 and 7.