Savi’s Warbler Life Cycle: Nest Building To Fledging (and everything in between)
Savi’s Warblers are rare summer visitors to the UK shores and can only be seen in a few selected Southern and Eastern areas of England. Named after the Italian ornithologist Paolo Savi, the Savi’s Warbler has a distinctive song that sounds like an insect buzzing.
Savi’s Warblers have a warm brown plumage which helps them to blend into their reed bed habitats. They have slender brown bills, a dark reddish-brown back which is sometimes tinged with green, whitish-buff underparts and buff eye stripes.
There are no differences between male and female birds although juveniles tend to be a more yellowy colour in their underparts. To find out more about these interesting passerines, keep reading.
Table of Contents
How Long Does A Savi’s Warbler Live?
The average lifespan for Savi’s Warblers is around 2 to 5 years. There are occasionally the odd individual that reaches a greater age including one bird who according to ring records lived for more than 9 years and 9 months.
These small passerine birds reach sexual maturity at around 1 year old.
How Fast Can A Savi’s Warbler Fly?
These small secretive birds undertake large migratory journeys and are known to fly at speeds of up to 20 to 30 mph (32 to 48 km/h). When in the UK, they spend most of their time hiding in dense reed beds and only typically fly when they feel threatened.
Are Savi’s Warblers Aggressive?
Generally Savi’s Warblers are not particularly aggressive birds. They can often be found in large numbers all sharing the same reed bed.
With that said, males can be incredibly territorial and can be heard singing aggressively at each other in close proximity, arguing over invisible boundaries.
What Is A Savi’s Warbler’s Habitat?
The habitat of the Savi’s Warbler is reed beds and marshes and can often be found in marshland that has some bushes. In the UK they can only be found in a few select sites in East Anglia and Southern England.
Savi’s Warblers migrate to Northern and Sub-saharan Africa to overwinter. There are only an estimated 10 breeding pairs of Savi’s Warblers spotted in the UK each year.
How Long Does It Take For A Savi’s Warbler To Build A Nest?
It takes the female around 3 to 7 days to build the nest depending on the availability of materials and environmental conditions. She will use grasses, reeds and other fine plant materials.
She uses thin plant stems that can be woven together to create a cup shaped nest typically close to the ground in dense vegetation. She will then line the nest with dried leaves, feathers and animal fur to make a warm and comfortable environment for the eggs and chicks.
The male doesn’t usually get involved in the nest building but rather stands guard to protect his breeding territory from other potential partners and attracts the female with his song.
Eggs
Once the female is happy with the construction of the nest she will lay her eggs as well as taking on most of the incubation duties. The male continues to guard the area but does occasionally help with chick feeding after they hatch.
When Do Savi’s Warblers Lay Eggs?
The eggs are laid at different times depending on the location of the nest. In the extreme southern end of the Savi’s Warblers range, egg laying starts in mid April while in Northern Europe, eggs are laid at the end of May.
The first males arrive at the breeding grounds and claim the best territories based on the density of reeds and sedges. The females then arrive and pair up with the males who have the most desirable breeding territories.
How Many Eggs Does A Savi’s Warbler Lay?
The female will lay anywhere between 4 to 6 eggs although the number of eggs laid is dependent on the health and age of the female. Sometimes a clutch will only contain 3 eggs.
What Do Savi’s Warbler Eggs Look Like?
The eggs of the Savi’s Warbler are a greyish-white colour which are speckled with grey-rusty red spots. The eggs are around 20 x 14 mm in size and weigh around 2.1 grams.
How Long Do Savi’s Warbler Eggs Take To Hatch?
The eggs are incubated solely by the female for around 12 to 14 days before they hatch. During this time the male is close by keeping watch over his mate and the nesting site.
Chicks
After the 12 or 14 days of constant incubation, the eggs hatch and the parents move onto the next stage in the life cycle of the Savi’s Warbler, raising their chicks.
How Many Chicks Does A Savi’s Warbler Have?
The number of chicks per brood should correspond to the number of eggs laid but there are often less chicks due to unfertilised eggs or other complications.
From a clutch of 5 eggs a typical brood will contain 3 or 4 chicks.
When Do Savi’s Warbler Chicks Open Their Eyes?
The chicks are altricial which means they are blind and naked when they hatch and rely on their parents for everything. They generally open their eyes around days 4 to 6.
Once they open their eyes the chicks can identify their parents and take more notice of their surroundings. The parents continue feeding the growing chicks right up until they fledge the nest.
When Do Savi’s Warbler Chicks Fledge?
The young Savi’s Warbler chicks start to grow their flight feathers and develop the necessary muscles to fly and typically fledge around 12 days after hatching.
SEE ALSO: Whooper Swan Diet and Size: Feeding Habits, Predators, and Measurements
Frequently Asked Questions
The average lifespan of a Savi’s Warbler is around 2 to 5 years. There have been individuals that have survived for far longer than this with one bird reaching more than 9 years according to ring records.
The eggs of the Savi’s Warbler are a geyish-white colour and covered in grey-rusty red spots.
No, Savi’s Warblers are not UK resident birds, they are summer visitors who come here to breed before flying to Africa to overwinter.
