The spread of the Black Death, an epidemic of bubonic plague caused by the bacterium Yersinia pestis, was spread by disease-bearing fleas carried in turn by infected rats. Recent research has disputed this.

https://www.britannica.com/event/Black-Death

Tsunami: some countries often have plans to help deal with ‘tidal waves’, such as this one from New Zealand.

getthru.govt.nz/disasters/tsunami/

That most dangerous of animals, the mosquito: www.who.int/features/factfiles/malaria/en/

Written, edited and produced by Mark Webster, original music by kraM Left, plus self-generated & Logic Pro 12 foley, Aotearoa New Zealand 2026