Cookies and email tracking
Cookie-agreed - Indicates user’s preference regarding the use of optional cookies
Aucp13n - Indicates whether to deliver cached content to the browser. Enables us to use caching to provide a more prompt service
SESSxxx - Indicates whether a user is logged-in to the BTO website. Allows us to give access to personalised or restricted content to logged-in users
JSESSIONID - Indicates whether a user is logged-in to a BTO survey application. Allows us to give access to data entry and survey management accounts
Some other temporary cookies may be used to facilitate specific functionality such as viewing embedded Youtube videos and downloading data from our survey applications
_ga / _gid / _gat - Google Analytics cookies. These cookies are used to collect information about how visitors use our website. We use the information to compile reports and to help us improve the website. The cookies collect information in an anonymous form, including the number of visitors to the website, where visitors have come to the website from, and the pages they visited. If you click on Google AdSense advert that brings you to the BTO website, that ‘conversion’ will be recorded anonymously. Read Google's overview of privacy and safeguarding data.
bto_campaign_extended / _medium / _appeal / _channel - BTO cookies to track the source of a website referral from BTO communications - on our social media accounts and in our print publications. These cookies are used to attribute a succesfully completed contribution on the website correctly, allowing us to judge the relative effectiveness of these different forms of communication.
_fpb - Facebook Pixel. Used to track conversions from our Facebook page and Facebook adverts we place that result in visits and activity on our website. The data reported to us by Facebook is anonymous. Facebook may associate these data with your Facebook account, and use them to tailor content and advertising to you, according to their terms of service.
While you can control the use of the optional cookies via our cookie opt-in banner, if you wish to suppress the use of required cookies you can do so by changing the settings in your browser. However, this may affect the performance of the BTO website in your browser, and some features may no longer work.
Find out how to manage cookies on popular browsers:
To opt out of being tracked by Google Analytics across all websites, visit http://tools.google.com/dlpage/gaoptout.
As a BTO member, Garden BirdWatcher, active surveyor or if you independently register to receive communications via email, email messages you receive may be trackable at an individual level.
This allows us to determine how successful emails are - whether they have been opened and whether links have been clicked. This information is used to improve our email communications and may occasionally be used to send relevant further communications in response to your actions (e.g. clicking a particular link) or inactions (e.g. not opening an email) - in accordance with your contact preferences.
You can unsubscribe from email communications at any time using the unsubscription link contained in each message.
Tackling invasives: unpicking the definitions
BTO's Head and Principle Ecologist David Noble breaks down what we really mean by 'invasive species'.
Making the most of BirdTrack data
We have been working to produce useful summaries for bird reports using data from the millions of annual BirdTrack records.