THE ANIMAL FILES

Eurasian wren

Troglodytes troglodytes

A bird that creeps through low cover can still cross open sea on migration.

The Eurasian wren searches crevices and tangled vegetation for small prey. A strong, trilling song can reveal a bird otherwise moving close to the ground. Winter roosts and documented migration show different responses to seasonal conditions.[1]

Follow the evidence ↓
Eurasian wren
Image: Alexis Lours · Commons · CC BY 4.0
Food
Insects, larvae and spiders[1]
Search sites
Crevices, logs and thick low vegetation[1]
Winter nights
Sheltered retreats and sometimes group roosting[1]

Searching tiny spaces

Wrens probe old masonry, fallen logs and vegetation, frequently moving with quick, jerky hops. Insect larvae form much of the diet, with spiders and some seeds also eaten. They mostly forage low down, although occasional movements higher in trees occur. The small spaces between stems can contain useful prey.[1]

A song above the cover

Males deliver complex songs with repeated trills, sometimes from an exposed low perch. Song is especially noticeable in spring but can be heard at other times. The sharp repeated contact call differs from the extended song. These vocal forms can help locate a bird before its moving body becomes visible.[1]

Short flights and long journeys

Daily flights are often brief and direct, but ringing recoveries show that migrating wrens can cross the North Sea. This evidence comes from birds identified in different places, not inference from wing size alone. In winter, sheltered holes and old nests provide roosts, and severe weather can bring birds together to roost.[1]

A COMMON MIX-UP

Do short daily flights prove wrens cannot migrate far?

No. Ringing recoveries document sustained migratory journeys, including sea crossings.[1]

TRY A LITTLE REASONING

What evidence is stronger than guessing migration ability from a short garden flight?

Reveal the explanation

An identified ringed bird recovered in a distant location demonstrates movement between the two places.[1]

Sources & editorial notes

Adapted and translated from the cited Wikipedia revisions, with source-linked reasoning. Image credit and licence are listed separately above.

Adapted and translated from Wikipedia contributors; exact revisions are linked below. CC BY-SA 4.0

  1. Wikipedia contributors — Troglodytes troglodytes (adapted and translated; exact revision)
  2. NCBI Taxonomy — Troglodytes troglodytes (identity and game lineage)

Last fact check:

One discovery leads to another

Great titSmall feet can become a food-holding tool.Parus major ↗Common starlingA moving cloud of starlings is built from neighbours reacting to neighbours.Sturnus vulgaris ↗Common blackbirdA black male does not make every blackbird black.Turdus merula ↗