Oceanodroma leucorhoa – Pedryn-Drycin Gynffon Fforchog – Probably a regular visitor in variable numbers.
See here for a summary and analysis of records to 2012
2000 Recorded only at Strumble Hd, where singles on 5,11 & 12 Oct and 3 Nov, 4 on 8 Sept and 11 on 31 Oct.
2001 3 St David’s Hd 16 Sept, total of 260 logged passing Strumble Hd on 10 dates, 19 Aug – 16 Sept, also one there 8 Nov, maxa 35 on 8 Sept, 81 on 15 Sept and 122 on 16 Sept, the latter a new daily max for Pembs.
2002 14 Goultrop Rds 3 Feb (KJSD, GHR, AS), 6 Strumble Hd 6 Feb (CB, GHR et al ). No autumn records.
2003 Singles Strumble Hd 8 Sept, 8 & 9 Oct, 2 on 6 Oct, 10 on 7 Oct, 15 on 4 Oct and 19 on 23 Sept.
2004 Strumble Hd 13 in August, 85 in Sept, 2 in Oct and 1 in Nov. Max passage 47 on 23 Sept. Only other record was of 3 in Newport Bay 23 Sept.
2005 One Strumble Hd 23 Aug, 4 on 27 Sept, 5 on 29 Sept, 29 on Oct, 22 on 2 Oct and 6 on 4 Nov. Singles S of Grassholm 18 Sept and N of the Smalls 20 Sept.
2006 Single Caldey Sound 29 Aug, Strumble Hd 29 Aug, 21 & 22 Sept and 1 Oct, with 2 on 7 Sept & 7 Oct.
Marked “wreck” inshore during onshore gales in Dec, when 7 Newgale 3 Dec, 3 on 4 Dec and 22 on 7 Dec, 7 Druidston 7 Dec, 14 Strumble Hd 8 Dec, with 4 on 9 Dec, c. 150 Freshwater W 5 Dec (a new county day max) 37 there 7 Dec. Singles seen in car parks at Cwm yr Eglwys 7 Dec and riverside, Haverfordwest, 3 Dec, latter rescued but later died.
2007 All records were from Strumble Head with singles on 3rd, 10th, 17th, 22nd and 24th Sept, and 3 on 25th Sept
2008 One in North Haven Skomer on 3rd Oct, otherwise all records were from Strumble Head where a single passed on the 11th Aug . & 13th Sept. In October, a total of 5 were logged on the 1st , 6 on the 2nd, and 9 on the 3rd.
2009 All records were – Strumble Head Singles in Sept on 8th & 9th another on 4th Oct with 3 on 5th Nov. Elsewhere one Ramsey 23rd Nov (2nd record for the island) and one at Freshwater West on 25th Nov.
2010 All records were from Strumble Head where in September, two passed on 12th, six on 15th, 120 on 16th and two on 17th. One passed on 19th Oct.
2011 Strumble Head had 75 birds which were recorded on eight dates between 13th Sept & 19th Oct, max 33 on 18th Sept. One was seen off Ramsey on 6th Oct.
This map was produced by the West Wales Biodiversity Information Centre using data collected between November and February for the BTO Atlas 2007-11, with additional data collected in 2011-12 winter to fill gaps in coverage.
| Leach’s Petrel | 1981-84 Winter Atlas | 2007-12 Winter Atlas |
| No. of hectads occupied | 1 | 4 (of 32) |
| Percentage of hectads | 3.6% | 12.5% |
| No of tetrads occupied | No data | 4 (of 499) |
| Percentage of tetrads | 0.8% |
2012 At Strumble Head 47 birds passed on five dates between 11th Sept & 28th Oct, max 29 on 18th Sept. A single off Ramsey on 11th Sept. Recorded passing Ramsey, one on 11th Sept and two on 18th.
2013 At Strumble Head a total of 37 birds passed on seven dates between 16th Sept & 3rd Nov, max 22 on 18th Sept.
2014 Only five recorded off Strumble Head this year, a single on 19th Oct and four on 21st of the same month. Ramsey had single birds on 21st Oct & 7th Nov, the first records there since 2011.
2015 At Strumble Head eleven birds recorded, a single on 21st Oct, nine on 21st Nov and another single on 11th Dec. One spring/early summer record, on May 22nd one seen from a boat 30 nautical miles SW of Skomer.
2016 A single bird on 30th Aug was the only record for the year.
2017 The best year for this species for some time at Strumble Head, 103 birds recorded, maximum 50 on 9th Sept. 22 recorded passing Ramsey on 15th Sept was an island record. One off Skomer on 21st Oct was observed to be taken by a Peregrine and another was seen the following day.
2018 The only records came from Strumble Head: seven on 21st Sept and three on 23rd Sept.
2019 Passage off Strumble Head, all records were in September: 19 on 1st, one on 4th, three on 5th and two on 7th. Elsewhere: one in Fishguard Harbour on 5 Sept and two off Teifi Estuary mouth on 4 Sept.
2020 One off Skomer 26 Aug and two off Strumble Head on 8 Oct, with one 16 Nov.
2021 – A total of 56 logged passing Strumble Head: four 29 Sept, in October twenty on 5th & 6th, one 21st and two on 29th; in November seven on 5th and one on 21st; and finally, one on 8 Dec.
One picked up and taken into care, ringed then released at Strumble Head on 7 Oct.
2022 – A total of 11 were logged passing Strumble Head, max day count was of eight on 26 Sept.
Records extracted from the Pembrokeshire Bird Reports which may contain more detail than shown here
Pembrokeshire Avifauna 