David has narrated a two part documentary called Swarm for BBC One. It's all about incredible invasions in nature - like killer bees and trillions of lake flies.
Part one will air on Sunday 4th January at 9:00pm and part two will air on Sunday 11th January at 9:00pm.
Part one will air on Sunday 4th January at 9:00pm and part two will air on Sunday 11th January at 9:00pm.