Wood Warbler Vs Willow Warbler: Key Differences Explained

If you’re fortunate enough to see any members of the warbler family here in the UK you might be wondering whether the bird you’ve spotted is a wood warbler or a willow warbler. At first glance, it can be difficult to tell the difference between these two small birds.

They are a similar size and weight and can both be seen in the UK at pretty much the same time of year. However, there are enough differences to make differentiating between the two possible. Keep reading to find out more.

Table of Contents

Key Takeaways

Willow warblers have grey-green backs with a yellow tinged breast and throat as well as a yellow supercilium
Wood warblers have bright yellow-green upperparts and white underparts as well as that bright yellow supercilium
Willow warblers are very similar to chiffchaffs with some birdwatchers lumping them together under the name of “willowchaffs”
The call of the wood warbler is said to sound like a coin spinning on a glass table top
Although wood warblers are slightly larger than willow warblers the difference is insignificant

What Is The Difference Between Wood Warbler And Willow Warbler?

Despite both of these pretty little warblers both arriving in the UK at around the beginning of April and leaving at around the same time (give or take a few weeks), it is possible to tell these two species apart if you know what you’re looking for.

The differences include;

Visual Differences

Willow warblers can be identified by their grey-green backs, yellow tinged breast and throat, as well as their yellow supercilium. Willow warblers are very similar in appearance to the chiffchaff but can be differentiated by their distinctive song (more on that later).

Wood warblers have bright yellow-green upperparts and white underparts as well as that bright yellow supercilium. They also have a broad, compact tail.

Differences In Habitat

The area where the birds are spotted can also offer some clues as to their species. Willow warblers are typically found in open woodlands which have birch, alder and willow trees making up the majority of the woods. They are not found so often in England and Wales any more, but seem to be thriving in Scotland and Northern Ireland.

Wood warblers prefer oak and beech woodlands as well as other mature forests all across the UK including areas in England, Wales, Scotland and Ireland.

Nests & Eggs

Both of these birds tend to make nests that are dome shaped, close to the ground with a small access hole in the side close to shrubs or bushes in their preferred habitats.

The eggs of both of these birds are very similar. Both being small, white and covered in brown spots or blotches.

Bird Calls

The song of these birds is an easy way to distinguish between the two species. Willow warblers have a distinctive melodic song which consists of a few clear whistling notes that begin quickly before dropping in pitch and ending on longer, more drawn out notes. The call of the willow warbler is far less distinctive and is easily confused with the calls of other birds.

Wood warblers have a call which has been described as similar to a coin spinning on a glass table top. It has fast zip-like notes speeding up into a trill before coming to a sudden stop.

Size & Weight

Wood warblers are slightly larger than willow warblers which doesn’t typically help much as the difference in size isn’t that significant especially when viewed from a distance.

Wood warblers are around 12 to 13 cm in length with a wingspan of around 19.5 to 24 cm. An adult wood warbler weighs around 8 to 12 grams.

Willow warblers are around 10.5 to 11.5 cm in length with a wingspan of between 16 to 22 cm. With an adult willow warbler weighing around 7 to 12 grams.

Frequently Asked Questions

What is the difference between a willow warbler and a wood warbler?

The difference between a willow warbler and a wood warbler is that wood warblers are slightly larger, have bright yellow-green upperparts and white underparts as well as a bright yellow supercilium. Whereas willow warblers have grey-green backs, yellow tinged breast and throat, as well as a yellow supercilium.

Are wood warblers rare?

Wood warblers are summer visitors to the UK and can typically be seen between April and September. Their numbers have declined in recent years but they can still be seen in oak and beech woodlands and other wooded areas with mature trees all across the UK.

Are willow warblers rare?

Willow warblers are a common summer visitor to the UK and can be seen from April to September in open woodlands which have birch, alder and willow trees making up the majority of the woods. They are more common in Scotland and northern Ireland than they are in other areas of the UK.