Evaluate the collective function of references cited together in a given text segment.
Classify their combined role into one of the following categories: 'method', 'background', or 'result'.

Text:) Botswana[102], Nigeria[87], South Africa[101], Zimbabwe[94] Comoro rousette (Rousettus oblivious) Comoros[107] House mouse (Mus musculus) Kenya[124], Madagascar[118] Pigs (Sus scrofa domesticus) South Africa[104, 122] Rusty-bellied brush-furred rat (Lophuromys sikapusi) Cameroon[109] L.
Category: