The third T20I match between India and South Africa at Centurion faced an unexpected delay due to a swarm of flying ants on the field. The umpires, after discussions with both teams, decided to suspend play as the insects were present in large numbers. The play was affected for half an hour.
source https://timesofindia.indiatimes.com/sports/cricket/india-in-south-africa/india-vs-south-africa-3rd-t20i-delayed-by-bizarre-reason-at-centurion/articleshow/115265383.cms
source https://timesofindia.indiatimes.com/sports/cricket/india-in-south-africa/india-vs-south-africa-3rd-t20i-delayed-by-bizarre-reason-at-centurion/articleshow/115265383.cms