anchor.diff:  "key_name","station_name","species_latin_name","english_name","individual_id","ring_number","colour_ring","individual_remarks","mass","sex","track_session_id","device_info_serial","tracker_id","track_session_start_date","track_session_end_date","track_session_start_latitude","track_session_start_longitude","track_session_remarks"
  -"HG_OOSTENDE","Oostende","Larus argentatus","Herring Gull",689,"H903183","YLAH","Wilma",859,"X",522,783,861,2013-05-24 00:00:00,9999-12-31 00:00:00,51.233056,2.930977,"Vismijn, Oostende"
  -"HG_OOSTENDE","Oostende","Larus argentatus","Herring Gull",688,"H903182","YKAT","Anne",859,"X",521,786,849,2013-05-24 00:00:00,9999-12-31 00:00:00,51.233056,2.930977,"Vismijn, Oostende"
  -"HG_OOSTENDE","Oostende","Larus argentatus","Herring Gull",687,"H903169","YLAT","Luc",1036,"X",523,799,651,2013-05-17 00:00:00,9999-12-31 00:00:00,51.233056,2.930977,"Vismijn, Oostende"
  -"HG_OOSTENDE","Oostende","Larus argentatus","Herring Gull",691,"H903185","YGAP","Jurgen",806,"X",520,801,772,2013-05-24 00:00:00,9999-12-31 00:00:00,51.233056,2.930977,"Vismijn, Oostende"
  -"HG_OOSTENDE","Oostende","Larus argentatus","Herring Gull",690,"H903184","YGAA","Nicky",1072,"X",519,804,862,2013-05-24 00:00:00,2016-06-04 00:00:00,51.233056,2.930977,"Vismijn, Oostende | Presumed dead."
  +"HG_OOSTENDE","Oostende","Larus argentatus","Herring Gull",689,"H903183","YLAH","Wilma",859,"F",522,783,861,2013-05-27 00:00:00,9999-12-31 00:00:00,51.233056,2.930977,"Vismijn, Oostende"
  +"HG_OOSTENDE","Oostende","Larus argentatus","Herring Gull",688,"H903182","YKAT","Anne",859,"F",521,786,849,2013-05-24 00:00:00,9999-12-31 00:00:00,51.233056,2.930977,"Vismijn, Oostende"
  +"HG_OOSTENDE","Oostende","Larus argentatus","Herring Gull",687,"H903169","YGAA","Luc",1072,"M",523,799,651,2013-05-27 00:00:00,9999-12-31 00:00:00,51.233056,2.930977,"Vismijn, Oostende"
  +"HG_OOSTENDE","Oostende","Larus argentatus","Herring Gull",691,"H903185","YLAT","Jurgen",1036,"M",520,801,772,2013-05-17 00:00:00,9999-12-31 00:00:00,51.233056,2.930977,"Vismijn, Oostende"
  +"HG_OOSTENDE","Oostende","Larus argentatus","Herring Gull",690,"H903184","YGAP","Nicky",806,"F",519,804,862,2013-05-27 00:00:00,2016-06-04 00:00:00,51.233056,2.930977,"Vismijn, Oostende | Presumed dead."
   "HG_OOSTENDE","Oostende","Larus argentatus","Herring Gull",818,"H903635","YWAZ","Robin",960,"M",14752,1601,787,2014-06-05 00:00:00,2022-08-01 00:00:00,51.233056,2.930977,"Visserskaai, Oostende"
   "HG_OOSTENDE","Oostende","Larus argentatus","Herring Gull",817,"H903644","YJAR","Jan",1014,"M",14751,6001,778,2014-06-05 00:00:00,2022-08-01 00:00:00,51.233056,2.930977,"Visserskaai, Oostende"
  -"HG_OOSTENDE","Oostende","Larus argentatus","Herring Gull",824,"H903621","ZVAR",,1034,"M",14758,6002,755,2014-05-30 00:00:00,2014-06-11 00:00:00,51.233056,2.930977,"- | Dead."
   "HG_OOSTENDE","Oostende","Larus argentatus","Herring Gull",825,"H903646","YJAZ","Rolanda",786,"F",14759,6002,755,2014-06-13 00:00:00,2022-08-01 00:00:00,51.233056,2.930977,"Vismijn, Oostende"
  +"HG_OOSTENDE","Oostende","Larus argentatus","Herring Gull",824,"H903621","ZVAR","Roland",1034,"M",14758,6002,755,2014-05-30 00:00:00,2014-06-11 00:00:00,51.233056,2.930977,"Vismijn, Oostende | Dead."
   "HG_OOSTENDE","Oostende","Larus argentatus","Herring Gull",814,"H903612","ZVAX","Karen",856,"F",14748,6003,756,2014-05-27 00:00:00,2022-08-01 00:00:00,51.233056,2.930977,"Vismijn, Oostende"
   "HG_OOSTENDE","Oostende","Larus argentatus","Herring Gull",813,"H900926","ZTAW","Hilde",778,"F",14747,6005,757,2014-05-23 00:00:00,2022-08-01 00:00:00,51.233056,2.930977,"Vismijn, Oostende"
   "HG_OOSTENDE","Oostende","Larus argentatus","Herring Gull",812,"H903614","ZTAK","Catia",811,"F",14746,6008,779,2014-05-23 00:00:00,2022-08-01 00:00:00,51.233056,2.930977,"Vismijn, Oostende"
   "HG_OOSTENDE","Oostende","Larus argentatus","Herring Gull",816,"H903613","ZVAT","Leslie",821,"F",14750,6013,735,2014-05-30 00:00:00,2022-08-01 00:00:00,51.233056,2.930977,"Vismijn, Oostende"
  -"HG_OOSTENDE","Oostende","Larus argentatus","Herring Gull",823,"H903607","ZVAW","Stefanie",0,"F",14757,6036,838,2014-06-13 00:00:00,2022-08-01 00:00:00,51.233056,2.930977,"Vismijn, Oostende"
  -"HG_OOSTENDE","Oostende","Larus argentatus","Herring Gull",822,"H903611","ZVAG",,859,"F",14756,6036,838,2014-05-27 00:00:00,2014-06-11 00:00:00,51.233056,2.930977,"- | Dead."
  +"HG_OOSTENDE","Oostende","Larus argentatus","Herring Gull",823,"H903607","ZVAW","Stefanie",846,"F",14757,6036,838,2014-06-13 00:00:00,2022-08-01 00:00:00,51.233056,2.930977,"Vismijn, Oostende"
  +"HG_OOSTENDE","Oostende","Larus argentatus","Herring Gull",822,"H903611","ZVAG","Stephanie",859,"F",14756,6036,838,2014-05-26 00:00:00,2014-06-11 00:00:00,51.233056,2.930977,"Vismijn, Oostende | Dead."
   "HG_OOSTENDE","Oostende","Larus argentatus","Herring Gull",821,"H903639","YKAW","Wendy",0,"F",14755,6037,839,2014-06-25 00:00:00,2022-08-01 00:00:00,51.339311,3.17913,"Kleine Vlakte, Zeebrugge"
  -"HG_OOSTENDE","Oostende","Larus argentatus","Herring Gull",820,"H903186","YWAL",,1021,"M",14754,6037,839,2014-06-05 00:00:00,2014-06-15 00:00:00,51.233056,2.930977,"- | Dead."
  +"HG_OOSTENDE","Oostende","Larus argentatus","Herring Gull",820,"H903186","YWAL","Walter",1021,"M",14754,6037,839,2014-06-05 00:00:00,2014-06-15 00:00:00,51.233056,2.930977,"Vismijn, Oostende | Dead."
   "HG_OOSTENDE","Oostende","Larus argentatus","Herring Gull",811,"H903604","ZVAU","Magda",852,"F",14745,6043,840,2014-05-23 00:00:00,2017-06-09 00:00:00,51.233056,2.930977,"Vismijn, Oostende | Tracker defect. Gull captured and tracker removed."
   "HG_OOSTENDE","Oostende","Larus argentatus","Herring Gull",815,"H903622","ZUAF","Tjess",1085,"M",14749,6069,993,2014-05-30 00:00:00,2022-08-01 00:00:00,51.233056,2.930977,"Vismijn, Oostende"
   "HG_OOSTENDE","Oostende","Larus argentatus","Herring Gull",819,"H903609","YLAY","Klaas",1098,"M",14753,6070,994,2014-06-05 00:00:00,2022-08-01 00:00:00,51.233056,2.930977,"Visserskaai, Oostende"
   "HG_OOSTENDE","Oostende","Larus argentatus","Herring Gull",1329,"H903294","ZZAA","Geert",1081,"M",15263,6119,11395,2016-05-31 12:00:00,2024-06-24 09:56:00,51.23292344,2.93118801,"Vismijn, Oostende"
   "HG_OOSTENDE","Oostende","Larus argentatus","Herring Gull",1332,"H905205","ZZAM","Rudy",1111,"M",15264,6144,11397,2016-06-02 12:00:00,2024-06-24 09:58:00,51.23292344,2.93118801,"Vismijn, Oostende"
   "HG_OOSTENDE","Oostende","Larus argentatus","Herring Gull",1333,"H903297","ZZAG","Mirte",899,"F",15265,6147,11398,2016-06-02 12:00:00,2024-06-24 10:01:00,51.23292344,2.93118801,"Vismijn, Oostende"
  -"HG_OOSTENDE","Oostende","Larus argentatus","Herring Gull",1134,"H903128","ZCAG","Dre",1068,"M",15066,6178,990,2015-05-31 14:00:00,2022-06-09 14:09:00,51.233008,2.931033,"Vismijn, Oostende"
  +"HG_OOSTENDE","Oostende","Larus argentatus","Herring Gull",1134,"H903128","ZCAG","Dre",1068,"M",15066,6178,990,2015-05-21 00:00:00,2022-06-09 14:09:00,51.233008,2.931033,"Vismijn, Oostende"
   "HG_OOSTENDE","Oostende","Larus argentatus","Herring Gull",1136,"H903133","ZBAA","Joanna",854,"F",15068,6183,11193,2015-06-02 14:00:00,2022-06-09 14:10:00,51.233008,2.931033,"Vismijn, Oostende"
   "HG_OOSTENDE","Oostende","Larus argentatus","Herring Gull",1101,"H903131","ZCAD","Lilian",826,"F",15025,6186,11196,2015-05-26 11:00:00,2022-05-27 20:25:00,51.233008,2.931033,"Vismijn, Oostende"
   "HG_OOSTENDE","Oostende","Larus argentatus","Herring Gull",1322,"H905201","ZWAG","Tessa",889,"F",15260,6187,11197,2016-05-23 12:00:00,2024-06-24 09:50:00,51.23292344,2.93118801,"Vismijn, Oostende"
  
positive.code: "HG_OOSTENDE","Oostende","Larus argentatus","Herring Gull",1364,"H900906","ZWAP","Koen",1057,"M",15268,6236,11439,2016-05-25 12:00:00,2024-06-24 10:03:00,51.23292344,2.93118801,"Vismijn, Oostende"
  "HG_OOSTENDE","Oostende","Larus argentatus","Herring Gull",1327,"H905324","ZZAB","Veronic",830,"F",15269,6239,11440,2016-05-25 12:00:00,2024-06-24 10:04:00,51.23292344,2.93118801,"Vismijn, Oostende"
  "HG_OOSTENDE","Oostende","Larus argentatus","Herring Gull",1325,"H905203","ZWAA","Maurice",1070,"M",15270,6240,11400,2016-05-23 12:00:00,2024-06-24 10:04:00,51.23292344,2.93118801,"Vismijn, Oostende"
  "HG_OOSTENDE","Oostende","Larus argentatus","Herring Gull",1763,"H905082","FZOZ",,896,"F",15679,6246,11442,2018-06-16 12:00:00,2025-06-12 09:14:00,51.23307723,2.93111801,
  "HG_OOSTENDE","Oostende","Larus argentatus","Herring Gull",1765,"H905085","FWOH",,851,"F",15681,6247,11443,2018-06-06 12:00:00,2025-06-12 09:16:00,51.23307723,2.93111801,
  "HG_OOSTENDE","Oostende","Larus argentatus","Herring Gull",1762,"H905081","FGOL",,1205,"M",15678,6248,11444,2018-06-06 12:00:00,2025-06-12 09:12:00,51.23307723,2.93111801,
  "HG_OOSTENDE","Oostende","Larus argentatus","Herring Gull",1764,"H905083","FROH",,813,"F",15680,6249,11445,2018-06-06 12:00:00,2025-06-12 09:15:00,51.23307723,2.93111801,
  "HG_OOSTENDE","Oostende","Larus argentatus","Herring Gull",1633,"H901822","CSOF","Niels",1159,"M",15530,6251,11448,2017-05-31 12:00:00,2025-08-23 15:19:00,51.34677899,3.17286175,"Bus, Zeebrugge"
  "HG_OOSTENDE","Oostende","Larus argentatus","Herring Gull",1632,"H907931","ZHAP","Silke",895,"F",15526,6254,11447,2017-05-29 12:00:00,2025-08-23 15:08:00,51.34506243,3.17324638,"Bus, Zeebrugge"
  "HG_OOSTENDE","Oostende","Larus argentatus","Herring Gull",1636,"H907934","CNOU","Joryck",999,"M",15535,6256,11449,2017-06-14 12:00:00,2025-08-23 15:44:00,51.23270846,2.92259421,"Visserskaai, Oostende"
  "HG_OOSTENDE","Oostende","Larus argentatus","Herring Gull",1630,"H907928","ZHAZ","Tine",881,"F",15528,6257,11450,2017-05-29 12:00:00,2025-08-23 15:14:00,51.34484898,3.17337673,"Kleine Vlakte, Zeebrugge"
  "HG_OOSTENDE","Oostende","Larus argentatus","Herring Gull",1627,"H907925","ZJAM","Sander",1084,"M",15525,6262,11452,2017-05-24 12:00:00,2025-08-23 15:04:00,51.34519746,3.1731407,"Bus, Zeebrugge"
  "HG_OOSTENDE","Oostende","Larus argentatus","Herring Gull",1631,"H907929","ZKAH","Rik",1247,"M",15532,6264,11453,2017-05-29 12:00:00,2025-08-23 15:22:00,51.34718107,3.17256134,"Kleine Vlakte, Zeebrugge"
  
negative.code: "H_GRONINGEN",,"Circus aeruginosus","Western Marsh Harrier",158,"5336455","NA","Kjell",540,"M",1469,634,585,2014-06-04 21:50:00,9999-12-31 00:00:00,53.295407,6.991777,"Kjell"
  "H_GRONINGEN",,"Circus aeruginosus","Western Marsh Harrier",836,"5325667","NA","Roelof",504,"M",14770,6064,844,2014-07-04 15:00:00,2021-08-27 16:21:00,53.26933247,6.98776603,"Roelof"
  "H_GRONINGEN",,"Circus aeruginosus","Western Marsh Harrier",1321,"5327085","NA","Job",513,"M",15254,6065,879,2016-06-18 07:46:00,2024-06-20 16:13:00,53.231376,7.131125,"Job"
  "LBBG_ZEEBRUGGE","Zeebrugge","Larus fuscus","Lesser Black-backed Gull",706,"L904812","URAL","Kees",869,"M",524,703,468,2013-05-30 00:00:00,9999-12-31 00:00:00,51.339311,3.17913,"APM Terminals, Zeebrugge | Poor tracker functioning after bird removed antenna."
  "LBBG_ZEEBRUGGE","Zeebrugge","Larus fuscus","Lesser Black-backed Gull",717,"L907450","UMAD","Billie",749,"F",525,712,466,2013-06-03 00:00:00,9999-12-31 00:00:00,51.339311,3.17913,"APM Terminals, Zeebrugge"
  "LBBG_ZEEBRUGGE","Zeebrugge","Larus fuscus","Lesser Black-backed Gull",715,"L907322","UMAT","Harry",978,"M",526,719,312,2013-06-04 00:00:00,9999-12-31 00:00:00,51.339311,3.17913,"APM Terminals, Zeebrugge"
  "LBBG_ZEEBRUGGE","Zeebrugge","Larus fuscus","Lesser Black-backed Gull",708,"L906623","UBAS","Marc",887,"M",527,744,456,2013-05-30 00:00:00,2013-06-27 00:00:00,51.339311,3.17913,"APM Terminals, Zeebrugge | Poor tracker functioning after bird removed antenna. Predated by fox."
  "LBBG_ZEEBRUGGE","Zeebrugge","Larus fuscus","Lesser Black-backed Gull",716,"L907407","USAT","Joke",712,"F",528,753,319,2013-06-10 00:00:00,2016-06-16 00:00:00,51.339311,3.17913,"APM Terminals, Zeebrugge | Dead."
  "LBBG_ZEEBRUGGE","Zeebrugge","Larus fuscus","Lesser Black-backed Gull",704,"L902124","UBAR","Wouter",974,"M",529,755,320,2013-05-31 00:00:00,9999-12-31 00:00:00,51.339311,3.17913,"APM Terminals, Zeebrugge | Poor tracker functioning after bird removed antenna."
  "LBBG_ZEEBRUGGE","Zeebrugge","Larus fuscus","Lesser Black-backed Gull",719,"L909213","UPAK","Chloe",792,"F",530,830,451,2013-05-30 00:00:00,9999-12-31 00:00:00,51.339311,3.17913,"APM Terminals, Zeebrugge | Poor tracker functioning after bird removed antenna."
  "LBBG_ZEEBRUGGE","Zeebrugge","Larus fuscus","Lesser Black-backed Gull",722,"L909887","USAS","Sanne",668,"F",531,833,452,2013-06-10 00:00:00,9999-12-31 00:00:00,51.339311,3.17913,"APM Terminals, Zeebrugge"
  "LBBG_ZEEBRUGGE","Zeebrugge","Larus fuscus","Lesser Black-backed Gull",707,"L906543","UPAV","Jozsa",711,"F",532,847,453,2013-05-31 00:00:00,9999-12-31 00:00:00,51.339311,3.17913,"APM Terminals, Zeebrugge | Poor tracker functioning after bird removed antenna."
  "LBBG_ZEEBRUGGE","Zeebrugge","Larus fuscus","Lesser Black-backed Gull",703,"L901266","UDAC","Hilbran",1064,"M",533,849,683,2013-06-03 00:00:00,9999-12-31 00:00:00,51.339311,3.17913,"APM Terminals, Zeebrugge"
  "LBBG_ZEEBRUGGE","Zeebrugge","Larus fuscus","Lesser Black-backed Gull",714,"L907172","URAM","Eric",918,"M",534,851,454,2013-05-28 00:00:00,9999-12-31 00:00:00,51.339311,3.17913,"APM Terminals, Zeebrugge"
  "LBBG_ZEEBRUGGE","Zeebrugge","Larus fuscus","Lesser Black-backed Gull",718,"L909197","UBAU","Misja",957,"M",535,852,719,2013-06-04 00:00:00,9999-12-31 00:00:00,51.339311,3.17913,"APM Terminals, Zeebrugge"
  "LBBG_ZEEBRUGGE","Zeebrugge","Larus fuscus","Lesser Black-backed Gull",705,"L902130","UPAC","Michelle",788,"F",536,853,865,2013-06-11 00:00:00,9999-12-31 00:00:00,51.339311,3.17913,"APM Terminals, Zeebrugge"
  "LBBG_ZEEBRUGGE","Zeebrugge","Larus fuscus","Lesser Black-backed Gull",723,"L916710","UDAR","Kate",734,"F",537,854,684,2013-06-04 00:00:00,9999-12-31 00:00:00,51.339311,3.17913,"APM Terminals, Zeebrugge"
  "LBBG_ZEEBRUGGE","Zeebrugge","Larus fuscus","Lesser Black-backed Gull",712,"L907004","UDAD","Jasmin",752,"F",538,858,455,2013-05-28 00:00:00,9999-12-31 00:00:00,51.339311,3.17913,"APM Terminals, Zeebrugge"
  "LBBG_ZEEBRUGGE","Zeebrugge","Larus fuscus","Lesser Black-backed Gull",721,"L909877","UMAF","Marieke",746,"F",539,860,693,2013-06-11 00:00:00,9999-12-31 00:00:00,51.339311,3.17913,"APM Terminals, Zeebrugge"
  "LBBG_ZEEBRUGGE","Zeebrugge","Larus fuscus","Lesser Black-backed Gull",711,"L906682","URAK","Hans",0,"M",540,861,695,2013-05-29 00:00:00,9999-12-31 00:00:00,51.339311,3.17913,"APM Terminals, Zeebrugge"
  "LBBG_ZEEBRUGGE","Zeebrugge","Larus fuscus","Lesser Black-backed Gull",710,"L906646","UAAM","Viki",837,"F",541,862,699,2013-06-10 00:00:00,9999-12-31 00:00:00,51.339311,3.17913,"APM Terminals, Zeebrugge"
  "LBBG_ZEEBRUGGE","Zeebrugge","Larus fuscus","Lesser Black-backed Gull",720,"L909681","UAAA","Lies",707,"F",542,863,700,2013-06-04 00:00:00,9999-12-31 00:00:00,51.339311,3.17913,"APM Terminals, Zeebrugge"
  "LBBG_ZEEBRUGGE","Zeebrugge","Larus fuscus","Lesser Black-backed Gull",709,"L906644","UAAN","Nico",833,"M",543,864,705,2013-06-03 00:00:00,9999-12-31 00:00:00,51.339311,3.17913,"APM Terminals, Zeebrugge | Poor tracker functioning after bird removed antenna."
  "LBBG_ZEEBRUGGE","Zeebrugge","Larus fuscus","Lesser Black-backed Gull",153,"5331094 ARNHEM","UPAG","Alex",862,"M",544,865,706,2013-06-12 00:00:00,9999-12-31 00:00:00,51.339311,3.17913,"APM Terminals, Zeebrugge | No or few tracking data within track session."
  "LBBG_ZEEBRUGGE","Zeebrugge","Larus fuscus","Lesser Black-backed Gull",713,"L907016","UCAX","Jules",1017,"M",545,866,707,2013-06-12 00:00:00,9999-12-31 00:00:00,51.339311,3.17913,"APM Terminals, Zeebrugge"
  "LBBG_ZEEBRUGGE","Zeebrugge","Larus fuscus","Lesser Black-backed Gull",803,"L909346","RZAS","Jeroen",1011,"M",14721,1400,867,2014-06-12 00:00:00,2022-08-01 00:00:00,51.339311,3.17913,"Kleine Vlakte, Zeebrugge"
  "LBBG_ZEEBRUGGE","Zeebrugge","Larus fuscus","Lesser Black-backed Gull",798,"L909341","PGAC","Yolandi",730,"F",14722,1401,784,2014-06-10 00:00:00,2022-08-01 00:00:00,51.339311,3.17913,"Kleine Vlakte, Zeebrugge"
  "LBBG_ZEEBRUGGE","Zeebrugge","Larus fuscus","Lesser Black-backed Gull",799,"L906110","PGAW","Katrien",843,"F",14723,1402,785,2014-06-11 00:00:00,2022-08-01 00:00:00,51.339311,3.17913,"Kleine Vlakte, Zeebrugge"
  