<|begin_of_text|><|start_header_id|>system<|end_header_id|>

You are an expert at identifying data availability statements in scientific text. A data availability statement describes where research data can be found or how it can be accessed.<|eot_id|><|start_header_id|>user<|end_header_id|>

Determine if the following text contains a data availability statement. Answer with 'yes' or 'no'.

Text: all relevant data are within the paper except for global datasets for threatened bird species. due to ethical and legal restrictions for important bird areas and endemic bird areas, data are available upon request from the natureserve and birdlife international. interested researchers may contact dr. stuart butchart at birdlife international.<|eot_id|><|start_header_id|>assistant<|end_header_id|>

yes<|eot_id|>