Be a Swift detective and work out when you think they’ll return…

Using the maps and information below can you and your family work out when the Swift’s will return to Walthamstow Wetlands?

Swifts are small birds that only weigh about 40g so its not very easy to put a tracker on them and for it to stay on long enough to record a full migration.  The map on the left shows the results of one tracker that the BTO (https://www.bto.org/our-science/topics/tracking/tracking-studies/swifts) attached to a bird called A320.  It seems to have arrived at Fowlmere, Cambridgeshire in early May.

However, we know that Swifts have been seen over Walthamstow Wetlands as early as the 13thApril.  The chart on the right shows the first siting’s at Walthamstow between 2015 and 2021.

We’ve been tracing the journey the swifts make since December on social media (Facebook, Twitter and Instagram).  You can see weather reports and descriptions of the obstacles they’ve faced over the last few months.

Some say the main factor is the weather, especially on the last leg of their journey over Spain and France. Others say it’s more to do with the availability of food in places like Liberia or Algeria.

You can see the Swift migration journey is very challenging.

Will you take the BirdRun challenge and work out when you think the swifts will arrive at Walthamstow Wetlands?

Have a Flutter