It contains the data of egg laying in Exp. 2. ID: identify of each replicate. Treatment: assigned treatment for each replicate (isolated, paired or grouped). #ind: the number of individuals in a container. Batch: identity of batch. FirstEgg: the day that first eggs are found in the container of each replicate. DurationEgg: the number of days from the FirstEgg until the end of experiment. TotalNegg: the total number of egg masses found in the container. Total/Treat: the number of egg masses laid by each individual. RelEgg: the relative number of egg mass produced by one individual in a day. Day25-62: the number of egg masses found in the container in every four days. Remarks: remarks for some replicates. We excluded several replicates for analyses, due to the absence of egg laying or low background mortality.