The bird atlas survey invites people to observe birds – Join in from your summer cottage or trip to Lapland!

The Breeding Bird Atlas of Finland is part of the monitoring of biodiversity. Breeding observations for the atlas can be easily recorded using a number of applications until the end of 2025. Observations in Lapland in particular are needed to support research.

Finland has extraordinary traditions in citizen science – with laypeople making observations that support research. For decades, birdwatchers in particular have produced invaluable information on Finnish bird populations and their changes.

The Fourth Breeding Bird Atlas project of Finland, the latest joint effort, was launched this spring. The goal is to collect, over a four-year period, observations on the distribution over the country of bird species during breeding season and their breeding evidence (certainty of breeding).

The latest information collected on breeding birds will be combined with extensive avian data and other environmental data previously collected in Finland. The previous Breeding Bird Atlases of Finland from 1974–1979, 1986–1989 and 2006–2010 (in Finnish) constitute an especially important reference dataset.

Breeding index and location are important

All you need for recording breeding observations is a smartphone and an observation application. Suitable applications include Tiira, Vihko ja iNaturalist. (links in Finnish only).

In addition to identifying the species, the observation site must be recorded in the application. In the atlas survey, Finland is divided into atlas squares of 10 km x 10 km. Individual observations from specific spots can also be recorded without knowing the exact atlas square.

The breeding evidence must also be indicated in the observations with a breeding index (in Finnish). The breeding index is a numerical index that indicates the likelihood of breeding based on the observation. The higher the score, the greater the breeding evidence. The index value of 1 denotes that the observation does not refer to breeding.

Observations should be made throughout the breeding season, from early spring to early autumn. Some species breed early, others late.

“It’s easy to think that the breeding season only encompasses the period when birds have their chicks. However, the breeding season begins already when, depending on the species, the birds start their territorial songs or aerial displays and ends with the sighting of fledglings that have recently left the nest,” says Heidi Björklund, coordinator of the Fourth Breeding Bird Atlas at the Finnish Museum of Natural History Luomus, which is part of the University of Helsinki.

Focusing on the breeding indices is important, since precisely that information is used as the basis for extracting content for the atlas from the mass of data received by the observation applications.

“You can report a thousand observations, but if none of them include a value for the breeding index, they will not be recorded in the atlas,” Björklund points out.

Covering all of Finland, Lapland included

The main objective of the latest atlas survey project, which has been ongoing for a few months, is to obtain increasingly comprehensive observations from Finland.

“It would be great to increase the number of observers during the project. I believe new people will join in as well, since in the coronavirus period people have become interested in nature and birdwatching as a hobby,” Björklund says.

In fact, Björklund urges summer cottage residents to take up birdwatching in the region around their cottages. This way, information can be collected more comprehensively. In addition, one extensive area should be better covered: Lapland.

“There are not enough birdwatchers in Lapland to cover the entire region, which is why it would be important for anyone who visits Lapland to observe the breeding of birds and report their observations.”

Plenty of time for observation

Although recording observations should be made without delay, there is no rush. The compilation of the latest Bird Breeding Atlas will continue until the end of the breeding season of 2025.

“In other words, everyone has plenty of time to verify breeding attempts in their surroundings for as many species as possible. In the end, we will be able to draw up a breeding distribution map for each species, composed of the atlas squares on which the species were observed. The accumulation of breeding bird atlas data can be followed in the results service of the atlas survey

The atlas survey funded by the Ministry of the Environment is carried out collaboratively by the Finnish Museum of Natural History Luomus at the University of Helsinki and BirdLife Finland with partners including the Finnish Environment Institute, Natural Resources Institute Finland and Metsähallitus.

Contact details:

  • Coordinators of the Fourth Breeding Bird Atlas of Finland at Luomus (Björklund) and BirdLife Finland (Aapo Salmela):


Indices indicate the likelihood of nesting

A value for the breeding index must be recorded for observations for the information to be transferred from the observation applications used to the Breeding Bird Atlas.

The index values range from one to eight. Two-digit sub-index values have been defined for the higher indices, the highest value being 82.

Index examples:

  • I hear a chaffinch singing once in a suitable habitat. => index 2
  • Couple of days later, a chaffinch is singing in the same location. => index 4
  • I see a hooded crow or a magpie carry a stick for the nest. => index 62 (sub-index of index 6)
  • I hear chicks calling in the nest. => index 81
  • I see eggs or chicks in the nest. => index 82

“You should keep in mind that all observations must be made on the terms of bird welfare. You should not go plodding through bushes to look for nests. If you happen to see a nest, you should observe it from afar. No index is worth disturbing bird breeding,” says Heidi Björklund, coordinator of the Fourth Breeding Bird Atlas of Finland from the Finnish Museum of Natural History Luomus.