Considered extinct as breeding species in the early 2000s, the Saker Falcon was recovered when the first active nest from the new history of the species in Bulgaria was discovered in 2018, formed of two birds that were re-introduced back in 2015. Currently, there is only one confirmed wild breeding pair in the country - the male from 2015 with a female changed in 2020, released again as a part of the programme, in 2016. This is a report on the preliminary results and analysis of the ongoing establishment phase of the re-introduction of the Saker Falcon (Falco cherrug) in Bulgaria - first ever performed for this species in the country and globally. The period studied is 2015-2020. Following the re-introduction activities started in 2011, the current phase is defined by standardised methodology and a unified approach. Analysed and presented are methods for captive breeding and hacking, the breeding performance of the falcons, the number of released individuals, data from the post-fledging dependence period and a model of population growth.

中文翻译：

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在保加利亚重新引进Saker Falcon（Falco cherrug）-到2020年正在进行的建立阶段的初步结果

Saker Falcon在2000年代初被视为灭绝种，在2018年发现保加利亚新物种史上的第一只活动巢时，Saker Falcon得以恢复，该巢由两只鸟类组成，并于2015年重新引入。是该国唯一被确认的野生繁殖对-2015年的雄性和2020年的雌性改变，作为该计划的一部分，于2016年再次发布。这是关于初步结果的报告，并对正在进行的建立阶段进行了分析。在保加利亚重新引入了Saker Falcon（Falco cherrug），这是该物种在该国乃至全球首次进行的表演。研究期间为2015年至2020年。在2011年开始重新引入活动之后，当前阶段由标准化方法和统一方法定义。