Sometimes nature can be so unpredictable, yet at other times, you can almost set your watch to it.
This has been the case with Monty and Glesni in 2015. They arrived back from migration exactly on time, laid eggs exactly when we'd expect them to, and bang on 37 days later, the first chick hatches from the first egg laid.
Monty & Glesni - teamwork and timing is the name of the day in 2015