Ant nest?

Ant nest?

Observation - Ant nest? - Southern Africa. Description: Observed in grassland dominated by Helichrysum kraussii, burned every 2-3 years. Could this be an ant or spider nest? We saw no other invertebrates nearby. There was not a spider inside (which we could see) and the grass fibres were not woven together wit

Observed in grassland dominated by Helichrysum kraussii, burned every 2-3 years. Could this be an ant or spider nest? We saw no other invertebrates nearby. There was not a spider inside (which we could see) and the grass fibres were not woven together with spider web.