Nesting birds are feeling the heat

01 May 2011 | No. 2011-17

After the warmest April since records began, worms and other invertebrates that garden birds need to rear their chicks are buried deep underground. The British Trust for Ornithology’s (BTO’s) Garden BirdWatch team offers advice on how to help.

The hard-baked ground is making life
difficult for birds such as thrushes
and Starlings that probe the soil for food.

Across much of the UK, the hard-baked ground is making life difficult for birds such as thrushes and Starlings that probe into the soil for food. April 2011 saw average daily temperatures nearly 4°C higher than the long-term average, as calculated since 1659, and rainfall – especially in southern England – was well below normal levels. Under similar conditions last year, which included the driest period from January to June in 80 years, BTO data show that the breeding productivity of Song Thrush and Blackbird suffered, both down by 21%. Young of these species are now fledging and their parents are trying to nest again, so now is a period of high demands.

As well as harbouring valuable foods, mud itself is an important nest material. Thrushes, for example, require plenty of mud to bind and shape their nests well. Through the year-round BTO Garden BirdWatch survey we know that Blackbirds occupy around 95% of gardens at this time of year, while Robins visit around 85%, Song Thrushes 30% and Mistle Thrushes around 5%. Other species such as the darting Nuthatch and the scintillating Swallow and House Martin also appear in good numbers. All of these birds require soft mud in order to build robust nests, so it is important that people do what they can to help.

The BTO’s Garden BirdWatch team recommends that householders sprinkle their lawn with water early in the morning or late in the evening, thereby avoiding the warmest part of the day when much will evaporate. Watering should be focused on well-shaded areas for the same reason, particularly those that are shaded during the morning, which will encourage dew to form that some species will drink. Importantly, sprinkling will also bring much needed invertebrates closer to the surface. Provide a reliable source of fresh water for drinking and bathing, and ensure that bird baths and feeders are cleaned regularly. By keeping a record of birds that visit gardens through BTO Garden BirdWatch people can also help to reveal the bigger picture of how birds are doing.

Dr Tim Harrison, BTO Garden BirdWatch, commented: “Fledglings of many species, including Robin, Blackbird and Song Thrush, are already cropping up in gardens this spring. For them, life can be tough as they search for food in the current arid conditions. By taking a few simple steps – like sprinkling the lawn, providing fresh water and feeding invertebrates such as mealworms – people can give these youngsters a better chance of survival.”

He added: “Another big way to help is by becoming a Citizen Scientist with the BTO. If you watch birds in your garden for at least a few minutes during most weeks then you can easily get involved in BTO Garden BirdWatch. A new three-week ‘taster’ version of the survey is helping even more people to give the survey a go and to chart the fortunes of garden birds.”

To request a free BTO Garden BirdWatch taster pack, which includes a copy of the Garden BirdWatch magazine Bird Table, email gbw [at] or phone 01842-750050.

Notes for Editors

  1. Top tips to help!
  • Sprinkle well-shaded areas of your lawn with water, early in the morning or late in the evening.
  • Provide a regular supply of clean fresh-water for drinking and bathing.
  • Feed mealworms or other invertebrates that could be provisioned to young. Small seeds such as nyjer and sunflower hearts will support many adult birds.
  • Clean feeders and bird baths regularly, and ensure that food remains fresh.
  • Rake through your compost heap for invertebrates and to provide soft nesting material
  1. The BTO is the UK’s leading bird research organisation. Over thirty thousand birdwatchers contribute to the BTO’s surveys. They collect information that forms the basis of conservation action in the UK. The BTO maintains a staff of 100 at its offices in Norfolk and Stirling, who analyse and publicise the results of project work. The BTO’s investigations are funded by government, industry and conservation organisations.
  2. The BTO Garden BirdWatch is the only nationwide survey of garden birds to run weekly throughout the year, providing important information on how birds use gardens, and how this use changes over time. Currently, some 15,000 people take part in the project. The project is funded by participants’ contributions and is the largest year-round survey of garden birds in the world. For more information see

Contact information

Tim Harrison (BTO Garden BirdWatch Development Officer)
Office: 01842 750050 (9am to 5.30pm)
Email: gbw [at]

Paul Stancliffe (BTO Press Officer)
Office: 01842 750050 (9am to 5.30pm)
Mobile: 07585 440910 (anytime)
Email: press [at]

Images are available for use alongside this News Release
Please contact images [at] quoting reference 2011-17

The BTO has an ISDN line available for radio interviews
Please contact us to book an interview
Office: 01842 750050

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