An increasingly regular visitor.

From a small feral population in Norfolk, this introduced species is now increasing and spreading in England.

The first record for Stevenage was of one at Fairlands Valley Lakes and the Town Centre Gardens between on 24 January and, 6 February 2007. One was subsequently seen at Fairlands Valley Lakes and, the Town Centre Gardens between 10 and 12 October 2007.

They were not recorded again until 2011 when up to two were at Fairlands Valley Lakes between 25 and 29 July 2011.

Subsequent records prior to 2020 are; two on the GSK Site Lake on 21 December 2018; two at Fairlands Valley Lakes on 17 and 29 March 2019; two adults and four juveniles at Fairlands Valley Lakes on 17, 21 and 29 September and 6 October 2019 (assumed to be the birds that bred at The Park, Knebworth House that summer); eight at Fairlands Valley Lakes on 21 November 2019; three at Fairlands Valley Lakes from 24 to 1 December 2019; two at Fairlands Valley Lakes from 2 December 2019 until 12 January 2020, with 11 seen on 15 December.

Since 2020 the records are: four at Fairlands Valley Lakes on 19 January 2020; one at Fairlands Valley Lakes on 16 March 2020; up to nine at Fairlands Valley Lakes between 23 and 27 July 2020; one on 28 October 2020; two adults and a juvenile at Fairlands Valley Lakes between 26 September and 23 November 2021; one at Fairlands Valley Lakes on 8 January 2022; two on 13 and 17 January 2022; two at Fairlands Valley Lakes on 28 April 2022; one at Fairlands Valley Lakes on 18 August 2022; one flying over Norton Green Tip on 23 August 2022; one at Fairlands Valley Lakes on 11 and 14 September 2022; up to seven at Fairlands Valley Lakes on various dates from 28 September to 11 December 2022; one seen feeding among c.200 Canada Geese (Branta canadensis) at Astonbury Farm on 16 November 2022; one at Fairlands Valley Lakes on 5 January 2023; one at Fairlands Valley Lakes on 17 May 2023; ; two at Fairlands Valley Lakes from 14 July to 28 November 2023 (with nine seen on 25 July and three on 29 August and 19 September); two at Astonbury Farm on 29 October 2023; Fairlands Valley Lakes one on 3, 2 and 11 February and 3, 4, 7 and 17 April 2024; two on 12 and 29 May 2024.

Two adults and a juvenile Fairlands Valley Lakes 1 October 2021