The six-spot burnet moth (Zygaena filipendulae) replicate counts from the Swiss butterfly monitoring program from Kery & Schaub (2011 p.445-446).
Details
The variables are as follows:
sitethe site.daythe day ("season").count1the first count.count2the second count.
References
Kery M & Schaub M (2011) Bayesian Population Analysis using WinBUGS. Academic Press. (https://www.vogelwarte.ch/en/research/population-biology/book-bpa/)