As Finland relaxes over the Easter weekend, conservationists are starting their annual drive to gather observations of more than 40 plant and animal species around Finland.
These observations, which are to be gathered over the next eight weekends, provide a picture of the progress of spring every two weeks.
People can send observations of the first sightings of different species outside of the eight weekends, when all sightings can be reported. Sightings can be reported electronically via the website, or on paper.
This year the Nature League's theme is pollinators, as there is continuing concern at their reduced numbers.
"This year we want to increase awareness of the importance of pollinators for biodiversity," said Lotta Ojajärvi of the Nature League in a press release.
The species to look out for this year include wasps, bumblebees and small tortoiseshell butterflies, as well as bilberries, dandelions and willow trees.
Observations sent in to the central database will help provide data to allow the comparison of springtime in different years, giving a picture of how climate change and other factors have impacted the changing of the seasons.
This is the 47th time the Nature League has organised the spring watch event.