Sources from this episode:

* Bullfighting

* Wikipedia: Bullfighte (https://en.wikipedia.org/wiki/Bullfighter)r

* Leigh & Morris: With the World's Great Travelers, Volume 3 (http://www.gutenberg.org/ebooks/35632)

* Bats

* The Verge: Not even bats are 'blind as a bat' (https://www.theverge.com/science/2017/7/5/15904354/bats-blind-myth-someone-lied-to-you)

* National Geographic: 6 Bat Myths Busted (https://news.nationalgeographic.com/news/2014/10/141031-bats-myths-vampires-animals-science-halloween/)

* Goldfish

* The Daily Mail (sorry): Old goldfish (http://www.dailymail.co.uk/news/article-2160273/The-boy-won-goldfish-funfair-aged-amazed-survives-24-years.html)

* Telegraph: Fish's memories last for months, say scientists (https://www.telegraph.co.uk/news/science/science-news/4158477/Fishs-memories-last-for-months-say-scientists.html)