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Species: Zonotrichia atricapilla

Taxonomic class: Aves

Population type: free-ranging

Geographical location: California, USA

Data collection technique: survey scan

Interaction type: group membership

Definition of interaction: Flocks were defined as a group of individuals found within a single 5 m radius. For each season, Simple Ratio association index was calculated for each pair of individuals, which ranged from 0 for pairs never seen in the same flock and 1 for pairs always seen in the same flock.

Edge weight type: frequency

Total duration of data collection: 4 months

Time resolution of data collection (within a day):

Time span of data collection (within a day): focal follow/ad libitum

Note: Networks represent social data collected during two non-breeding seasons: October 2010�February 2011 (Season 2) and October2011�April 2012 (Season 3).




list of igraph objects


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Shizuka, Daizaburo, et al. "Across‐year social stability shapes network structure in wintering migrant sparrows." Ecology letters 17.8 (2014): 998-1007.