Nocturnal but not diurnal threats shape stopover strategy in a migrating songbird

Songbird migration involves frequent migratory flights interrupted by several days of stopover to refuel. For first-year migratory birds, this entails stopping in unfamiliar locations to exploit local resources and maximize fuelling rates. However, stopovers also pose mortality risks due to predator presence. We investigated whether auditory cues from two avian predators with contrasting hunting strategies—the diurnal Eurasian sparrowhawk (Accipiter nisus), which captures prey in flight, and the nocturnal tawny owl (Strix aluco), which relies on pouncing attacks—trigger different anti-predator responses in the nocturnally migrating European robin (Erithacus rubecula). We found that robins react to the perceived risk of predation by the nocturnal predator but did not alter their strategy in response to diurnal predator cues. Robins reduced foraging activity under perceived predation risk at night and decreased their fuel deposition rates over the stopover period. Lower body condition aft..., , # Nocturnal but not diurnal threats shape stopover strategy in a migrating songbird

Dataset DOI: [10.5061/dryad.k0p2ngfk6](10.5061/dryad.k0p2ngfk6)

## Description of the data and file structure

This dataset contains daily measurements of mean food intake, body condition, activity levels, and departure time after sunset from juvenile European robins (*Erithacus rubecula*). Individuals were assigned to one of two separate experiments, each with control and treatment groups, to assess anti-predator responses triggered by auditory cues from two avian predators: the diurnal Eurasian sparrowhawk (*Accipiter nisus*) and the nocturnal tawny owl (*Strix aluco*). The accompanying R script used for data analysis and to produce the results reported in the associated article is also included.

### Files and variables

#### File: Data.csv

**Description:** Dataset containing daily average measurements for the two experiments and the two experimental groups.

##### Variables

* *Experiment*: Facto...,