A spokesman for the BTO has said that roof insulation could be contributing to the decline in the number of house sparrows. Numbers have dropped by 70% since the 1960s and house sparrows in urban and suburban area are faring the worst.
The report says number of starlings and house martins had also fallen by about 50% over the last 40 years.
Paul Stancliffe, a spokesman pointed out there were other reasons for the decline, such as reduced winter food availability, but said loft insulation was undoubtedly a factor as people looked to save money on energy bills.
He suggested homeowners should put up a nest box with a 32mm entrance hole to provide an alternative nesting space where possible.
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The report says number of starlings and house martins had also fallen by about 50% over the last 40 years.
Paul Stancliffe, a spokesman pointed out there were other reasons for the decline, such as reduced winter food availability, but said loft insulation was undoubtedly a factor as people looked to save money on energy bills.
He suggested homeowners should put up a nest box with a 32mm entrance hole to provide an alternative nesting space where possible.
Article here