Ecologist and earth scientist working at the intersection of biodiversity and sustainability transitions.https://barthoekstra.com/https://barthoekstra.com/projects/20260405-gallery-showcase/https://barthoekstra.com/projects/20260405-gallery-showcase/Sun, 05 Apr 2026 00:00:00 GMThttps://barthoekstra.com/projects/20251201-3500-raptors-later-a-long-overdue-update/https://barthoekstra.com/projects/20251201-3500-raptors-later-a-long-overdue-update/Mon, 01 Dec 2025 00:00:00 GMThttps://barthoekstra.com/projects/20200801-batumi-raptor-count-in-british-birds/https://barthoekstra.com/projects/20200801-batumi-raptor-count-in-british-birds/Sat, 01 Aug 2020 00:00:00 GMThttps://barthoekstra.com/projects/20191223-brc-autumn-report-is-online-1/https://barthoekstra.com/projects/20191223-brc-autumn-report-is-online-1/Mon, 23 Dec 2019 00:00:00 GMThttps://barthoekstra.com/projects/20191031-brc-2019-october-photo-report/https://barthoekstra.com/projects/20191031-brc-2019-october-photo-report/Thu, 31 Oct 2019 00:00:00 GMThttps://barthoekstra.com/projects/20191029-brc-2019-september-photo-report/https://barthoekstra.com/projects/20191029-brc-2019-september-photo-report/Tue, 29 Oct 2019 00:00:00 GMThttps://barthoekstra.com/projects/20191028-brc-2019-august-photo-report/https://barthoekstra.com/projects/20191028-brc-2019-august-photo-report/Mon, 28 Oct 2019 00:00:00 GMThttps://barthoekstra.com/projects/20190509-estonian-highlights/https://barthoekstra.com/projects/20190509-estonian-highlights/Thu, 09 May 2019 00:00:00 GMThttps://barthoekstra.com/projects/20190312-presenting-first-results-of-batumi-raptor-count-at-the-2019-dutch-ornithological-union-nou-congress/https://barthoekstra.com/projects/20190312-presenting-first-results-of-batumi-raptor-count-at-the-2019-dutch-ornithological-union-nou-congress/Tue, 12 Mar 2019 00:00:00 GMThttps://barthoekstra.com/projects/20190222-photo-realistic-shaded-relief-using-blender/https://barthoekstra.com/projects/20190222-photo-realistic-shaded-relief-using-blender/Fri, 22 Feb 2019 00:00:00 GMThttps://barthoekstra.com/projects/20190124-brc-2018-october-photo-video-report/https://barthoekstra.com/projects/20190124-brc-2018-october-photo-video-report/Thu, 24 Jan 2019 00:00:00 GMThttps://barthoekstra.com/projects/20190123-brc-2018-september-photo-video-report/https://barthoekstra.com/projects/20190123-brc-2018-september-photo-video-report/Wed, 23 Jan 2019 00:00:00 GMThttps://barthoekstra.com/projects/20190122-brc-2018-august-photo-video-report/https://barthoekstra.com/projects/20190122-brc-2018-august-photo-video-report/Tue, 22 Jan 2019 00:00:00 GMThttps://barthoekstra.com/projects/20190120-i-moved-to-a-rough-neigborhood/https://barthoekstra.com/projects/20190120-i-moved-to-a-rough-neigborhood/Sun, 20 Jan 2019 00:00:00 GMThttps://barthoekstra.com/projects/20190108-arctic-winds/https://barthoekstra.com/projects/20190108-arctic-winds/Tue, 08 Jan 2019 00:00:00 GMThttps://barthoekstra.com/projects/20190106-vismig-highlights-december-2018/https://barthoekstra.com/projects/20190106-vismig-highlights-december-2018/Sun, 06 Jan 2019 00:00:00 GMThttps://barthoekstra.com/projects/20181210-brc-autumn-report-is-online/https://barthoekstra.com/projects/20181210-brc-autumn-report-is-online/Mon, 10 Dec 2018 00:00:00 GMThttps://barthoekstra.com/projects/20181205-vismig-highlights-november-2018/https://barthoekstra.com/projects/20181205-vismig-highlights-november-2018/Wed, 05 Dec 2018 00:00:00 GMThttps://barthoekstra.com/projects/20181111-a-congregation-of-short-eareds/https://barthoekstra.com/projects/20181111-a-congregation-of-short-eareds/Sun, 11 Nov 2018 00:00:00 GMThttps://barthoekstra.com/projects/20181105-vismig-highlights-october-2018/https://barthoekstra.com/projects/20181105-vismig-highlights-october-2018/Mon, 05 Nov 2018 00:00:00 GMThttps://barthoekstra.com/projects/20180623-5-reasons-why-you-should-not-participate-in-batumi-raptor-count/https://barthoekstra.com/projects/20180623-5-reasons-why-you-should-not-participate-in-batumi-raptor-count/Sat, 23 Jun 2018 00:00:00 GMThttps://barthoekstra.com/projects/20180603-vismig-highlights-may-2018/https://barthoekstra.com/projects/20180603-vismig-highlights-may-2018/Sun, 03 Jun 2018 00:00:00 GMThttps://barthoekstra.com/projects/20180505-vismig-highlights-april-2018/https://barthoekstra.com/projects/20180505-vismig-highlights-april-2018/Sat, 05 May 2018 00:00:00 GMThttps://barthoekstra.com/projects/20180404-vismig-highlights-march-2018/https://barthoekstra.com/projects/20180404-vismig-highlights-march-2018/Wed, 04 Apr 2018 00:00:00 GMThttps://barthoekstra.com/projects/20180201-common-gull-larus-canus/https://barthoekstra.com/projects/20180201-common-gull-larus-canus/Thu, 01 Feb 2018 00:00:00 GMThttps://barthoekstra.com/projects/20180131-harriers-harriers-harriers/https://barthoekstra.com/projects/20180131-harriers-harriers-harriers/Wed, 31 Jan 2018 00:00:00 GMThttps://barthoekstra.com/projects/20180127-a-blessing-from-the-high-arctic/https://barthoekstra.com/projects/20180127-a-blessing-from-the-high-arctic/Sat, 27 Jan 2018 00:00:00 GMThttps://barthoekstra.com/projects/20180112-red-footed-falcon-falco-vespertinus/https://barthoekstra.com/projects/20180112-red-footed-falcon-falco-vespertinus/Fri, 12 Jan 2018 00:00:00 GMThttps://barthoekstra.com/projects/20180105-an-almost-empty-beach/https://barthoekstra.com/projects/20180105-an-almost-empty-beach/Fri, 05 Jan 2018 00:00:00 GMThttps://barthoekstra.com/projects/20180103-its-not-just-raptors-at-batumi-raptor-count/https://barthoekstra.com/projects/20180103-its-not-just-raptors-at-batumi-raptor-count/Wed, 03 Jan 2018 00:00:00 GMThttps://barthoekstra.com/projects/20171231-2017-recap-this-years-birding-highlights/https://barthoekstra.com/projects/20171231-2017-recap-this-years-birding-highlights/Sun, 31 Dec 2017 00:00:00 GMThttps://barthoekstra.com/projects/20171229-birding-the-chorokhi-delta/https://barthoekstra.com/projects/20171229-birding-the-chorokhi-delta/Fri, 29 Dec 2017 00:00:00 GMThttps://barthoekstra.com/projects/20171212-sea-storks/https://barthoekstra.com/projects/20171212-sea-storks/Tue, 12 Dec 2017 00:00:00 GMThttps://barthoekstra.com/projects/20171126-the-white-wingers-are-back/https://barthoekstra.com/projects/20171126-the-white-wingers-are-back/Sun, 26 Nov 2017 00:00:00 GMThttps://barthoekstra.com/projects/20171112-at-the-end-of-the-rainbow/https://barthoekstra.com/projects/20171112-at-the-end-of-the-rainbow/Sun, 12 Nov 2017 00:00:00 GMThttps://barthoekstra.com/projects/20171110-when-the-photos-are-better-than-the-count/https://barthoekstra.com/projects/20171110-when-the-photos-are-better-than-the-count/Fri, 10 Nov 2017 00:00:00 GMThttps://barthoekstra.com/projects/20171015-a-first-for-de-vulkaan/https://barthoekstra.com/projects/20171015-a-first-for-de-vulkaan/Sun, 15 Oct 2017 00:00:00 GMThttps://barthoekstra.com/projects/20170915-manx-madness/https://barthoekstra.com/projects/20170915-manx-madness/Fri, 15 Sep 2017 00:00:00 GMThttps://barthoekstra.com/projects/20170908-a-recipe-for-spectacular-migration-batumi-raptor-count-2017/https://barthoekstra.com/projects/20170908-a-recipe-for-spectacular-migration-batumi-raptor-count-2017/Fri, 08 Sep 2017 00:00:00 GMThttps://barthoekstra.com/projects/20170905-how-to-count-70-000-honey-buzzards/https://barthoekstra.com/projects/20170905-how-to-count-70-000-honey-buzzards/Tue, 05 Sep 2017 00:00:00 GMThttps://barthoekstra.com/projects/20170519-rip-deadcat/https://barthoekstra.com/projects/20170519-rip-deadcat/Fri, 19 May 2017 00:00:00 GMThttps://barthoekstra.com/projects/20170131-sanderlings/https://barthoekstra.com/projects/20170131-sanderlings/Tue, 31 Jan 2017 00:00:00 GMThttps://barthoekstra.com/projects/20170126-when-a-hybrid-is-better-than-the-real-thing/https://barthoekstra.com/projects/20170126-when-a-hybrid-is-better-than-the-real-thing/Thu, 26 Jan 2017 00:00:00 GMThttps://barthoekstra.com/projects/20170123-gullfest-scheveningen/https://barthoekstra.com/projects/20170123-gullfest-scheveningen/Mon, 23 Jan 2017 00:00:00 GMThttps://barthoekstra.com/projects/20160611-moerasochtend-heidenacht/https://barthoekstra.com/projects/20160611-moerasochtend-heidenacht/Sat, 11 Jun 2016 00:00:00 GMThttps://barthoekstra.com/projects/20160513-roodpootvalken/https://barthoekstra.com/projects/20160513-roodpootvalken/Fri, 13 May 2016 00:00:00 GMThttps://barthoekstra.com/projects/20160504-sometimes-i-shoot-game-birds/https://barthoekstra.com/projects/20160504-sometimes-i-shoot-game-birds/Wed, 04 May 2016 00:00:00 GMThttps://barthoekstra.com/projects/20160318-enjoy-it-while-it-lasts/https://barthoekstra.com/projects/20160318-enjoy-it-while-it-lasts/Fri, 18 Mar 2016 00:00:00 GMThttps://barthoekstra.com/projects/20160318-zolang-het-nog-kan/https://barthoekstra.com/projects/20160318-zolang-het-nog-kan/Fri, 18 Mar 2016 00:00:00 GMThttps://barthoekstra.com/projects/20160313-smile-makers/https://barthoekstra.com/projects/20160313-smile-makers/Sun, 13 Mar 2016 00:00:00 GMThttps://barthoekstra.com/projects/20160224-partridge-paradise/https://barthoekstra.com/projects/20160224-partridge-paradise/Wed, 24 Feb 2016 00:00:00 GMThttps://barthoekstra.com/projects/20160224-patrijzenparadijs/https://barthoekstra.com/projects/20160224-patrijzenparadijs/Wed, 24 Feb 2016 00:00:00 GMThttps://barthoekstra.com/projects/20160213-birds-of-scheveningen/https://barthoekstra.com/projects/20160213-birds-of-scheveningen/Sat, 13 Feb 2016 00:00:00 GMThttps://barthoekstra.com/projects/20160213-scheveningse-vogels/https://barthoekstra.com/projects/20160213-scheveningse-vogels/Sat, 13 Feb 2016 00:00:00 GMThttps://barthoekstra.com/projects/20160211-purple-sandpiperzzz/https://barthoekstra.com/projects/20160211-purple-sandpiperzzz/Thu, 11 Feb 2016 00:00:00 GMThttps://barthoekstra.com/projects/20160210-ringing-session-at-nou-congress/https://barthoekstra.com/projects/20160210-ringing-session-at-nou-congress/Wed, 10 Feb 2016 00:00:00 GMThttps://barthoekstra.com/projects/20160210-ringsessie-nou-congres/https://barthoekstra.com/projects/20160210-ringsessie-nou-congres/Wed, 10 Feb 2016 00:00:00 GMThttps://barthoekstra.com/projects/20160118-bohemian-waxwing/https://barthoekstra.com/projects/20160118-bohemian-waxwing/Mon, 18 Jan 2016 00:00:00 GMThttps://barthoekstra.com/projects/20160118-pestvogel/https://barthoekstra.com/projects/20160118-pestvogel/Mon, 18 Jan 2016 00:00:00 GMThttps://barthoekstra.com/projects/20160116-morning-foxes/https://barthoekstra.com/projects/20160116-morning-foxes/Sat, 16 Jan 2016 00:00:00 GMThttps://barthoekstra.com/projects/20160116-ochtendvossen/https://barthoekstra.com/projects/20160116-ochtendvossen/Sat, 16 Jan 2016 00:00:00 GMThttps://barthoekstra.com/projects/20160116-the-first-photo-on-a-new-blog-laaks-great-northern-loon/https://barthoekstra.com/projects/20160116-the-first-photo-on-a-new-blog-laaks-great-northern-loon/Sat, 16 Jan 2016 00:00:00 GMThttps://barthoekstra.com/projects/20160115-de-eerste-foto-op-een-nieuwe-blog-de-ijsduiker-van-laak/https://barthoekstra.com/projects/20160115-de-eerste-foto-op-een-nieuwe-blog-de-ijsduiker-van-laak/Fri, 15 Jan 2016 00:00:00 GMThttps://barthoekstra.com/projects/20150403-mellow-mornings/https://barthoekstra.com/projects/20150403-mellow-mornings/Fri, 03 Apr 2015 00:00:00 GMThttps://barthoekstra.com/projects/20150402-early-start/https://barthoekstra.com/projects/20150402-early-start/Thu, 02 Apr 2015 00:00:00 GMThttps://barthoekstra.com/projects/20140812-heathland-is-wonderful/https://barthoekstra.com/projects/20140812-heathland-is-wonderful/Tue, 12 Aug 2014 00:00:00 GMT