This is a whooper swan video from Britain.
From Wildlife Extra:
Three of the cygnets are slightly lighter in colour, which suggest that this is in fact two broods of six and three. The likelihood is that the smaller brood has been adopted as they could have lost their parents during the migration, which is not unusual in poor weather, and subsequently latched onto the family.
Centre manager Andy Wooldridge, said: “It is not completely unusual for swans to adopt cygnets that have been orphaned through the migration journey. The research undertaken at Martin Mere is starting to show this trend more and more, making this an invaluable source of information on the migration habits of these birds.”
3-4 cygnets more usual
Whooper swans spend the breeding season in Iceland before flying over to winter in the UK, with Martin Mere welcoming approximately seven percent of the Icelandic population from November to March. A pair of whooper swans would usually expect to have three to four cygnets per year, and the cygnets could be as young as one month old when they make the migration journey.
Pair for life
Whooper swans tend to pair for life, and research is being undertaken at Martin Mere to ring the swans with their own identification numbers. It will then be possible to start building pictures of their family trees and migration habits. One of the parents of this brood, H3V, first visited Martin Mere in 2006, but his mate is currently unringed.
Visitors can currently experience a swan spectacular at Martin Mere everyday at 3pm and 3.30pm when the swans have their daily feed.