Just saw this and thought ud all like to see User jeanbaby106, in the Pet Rats subreddit, 04 Oct 2021
TIL rats laugh and become more optimistic when they are tickled User komandanto_en_bovajo, in the Today I Learned (TIL) subreddit, 04 Oct 2021
TIL that if you tickle rats they enjoy it and 'laugh' and this can cause them to have more optimistic decision-making User User5645, in the Today I Learned (TIL) subreddit, 23 Aug 2016