Skip to main content
BTO
BTO
Main menu
Main navigation
About us
Contact us
Jobs and opportunities
How we work
Our history
Strategy
Where we work
Who we are
Our work
BTO Youth
Consultancy
Engagement
News
Publications
Science
The difference we make
Training
Support us
Corporate Membership
Donate
Fundraise
Join
Leave a gift in your Will
Shop
Volunteer
Donate to an appeal
Get involved
BTO Youth
Events
Report something
Volunteer
Volunteer resources
Work with us
Explore our data
BirdFacts Species
Survey data availability
Tools and products
Learn
About birds
Community
Develop your skills
Helping birds
Training
Projects
Search
Visit our search page for more options >
Search
Donate, Join, Volunteer
Donate
Join
Volunteer
User account menu
MyBTO
MyBTO
User account menu
MyBTO
MyBTO
Search
Visit our search page for more options >
Search
Donate, Join, Volunteer
Donate
Join
Volunteer
Main navigation
About us
Contact us
Jobs and opportunities
How we work
Our history
Strategy
Where we work
Who we are
Our work
BTO Youth
Consultancy
Engagement
News
Publications
Science
The difference we make
Training
Support us
Corporate Membership
Donate
Fundraise
Join
Leave a gift in your Will
Shop
Volunteer
Donate to an appeal
Get involved
BTO Youth
Events
Report something
Volunteer
Volunteer resources
Work with us
Explore our data
BirdFacts Species
Survey data availability
Tools and products
Learn
About birds
Community
Develop your skills
Helping birds
Training
Projects
Page menu
Indices for waterbird populations
Page menu
Research reports
Indices for waterbird populations
On this page
Close page menu
Indices for waterbird populations
1989
Download PDF
Scroll down
Back to top