50 billion birds, but many species are rare

50 billion birds, but many species are rare

By Roy van Grunsven The question: “How many birds are there?” seems very simple but it is hard to answer. You can’t simply count them. But there is data from citizens reporting bird observations around the world and using this scientist from the University of New...
Pollution and Citizen Science

Pollution and Citizen Science

By Roy van Grunsven Citizen Science has frequently been instrumental in putting topics on the scientific and political agenda. One very clear recent example is the insect decline in Germany, based on citizen science it was discovered that there was a 76% decline in...
Moth declines in the UK

Moth declines in the UK

The UK has a long history of citizen scientists recording biodiversity, including moths. Together with professionally collected data this has resulted in the publication of  The State of Britain’s Larger Moths 2021. There is a decline of 33% in the total number of...