Puffins can be seen on Skomer from April until August, though in early April they may be here in large numbers on one day with none the next, until they settle mid-month. Mid-June to mid-July is the time to see really big numbers, as parents are busy to-ing and fro-ing with food for theiri chicks. Numbers are also swelled then by birds too young to breed but are prospecting for the future. By the first week in August only a handful remain, and these are soon to depart, leaving the Puffin colonies deserted again until the following spring.