Whilst inspecting a breeding colony of Red-billed Queleas, Quelea quelea, amongst Acacia mellifera trees 8km north of Gumare, Botswana (19°17'36"S, 22°10'48"E) on 12 March 1999, we observed that many nests had Armoured Bush Crickets (also known as Armoured Ground Crickets, Corn Crickets or Koringkrieke), Acanthoplus discoidalis (Walker), on them. Closer inspection revealed that many of these insects were entering the nests or were already inside. Several nestlings in these nests were bleeding. We were thus able to confirm a report by Mr Kekopamang Mbwe, a scout of the Division of Plant Protection, Ministry of Agriculture, Botswana, that the crickets attack quelea nestlings. Mr Mbwe reported that they even kill very young birds, but we did not see nestlings dying from the attacks. Similarly, at a colony in the Northern Cape Province of South Africa, Anderson et al. (1994) suspected that A. discoidalis were killing Red-billed Quelea nestlings but only saw the insects eating dead chicks in the nests or corpses of fledglings pinioned on thorns. Anderson et al. did report, however, an observation by Richard Liversidge that the crickets killed nestlings of the Desert Cisticola, Cisticola aridula. In addition, Steyn and Myburgh (2000) found seven Armoured Bush Crickets in a nest of the Rufous-eared Warbler, Malcorus pectoralis, near Brandvlei, also in the Northern Cape Province, and blamed the crickets for frequent disappearances of chicks from nests.