Fig 1.
A. Barn swallow wearing an Encounternet tag. B. Encounternet receiver station. C. Tagged swallows interacting.
Fig 2.
A. Illustration of a staggered log. One tag records for at least one additional pulse. In this study, the pulse rate was set at 20s. B. Illustration of a broken log.
One tag records two separate logs while the other in the dyad records one continuous log.
Fig 3.
Received signal strength indicator (RSSI) values recorded between 11 tag pairs across seven different tag-tag distances.
Two tag antenna orientations (parallel = white boxes, perpendicular = gray boxes) were tested for each distance and three RSSI values were recorded for each antenna orientation.
Fig 4.
Frequencies of tag-tag logs with different maximum received signal strength indicator (RSSI) values.
Tags only log encounters of maximum RSSI ≥ 0. n = 975 logs, n = 17 tagged barn swallows, and 15 hours of logging data over three days.
Fig 5.
Frequencies of tag-tag durations.
Inset shows the interactions >1000 s. n = 975 logs, n = 17 tagged barn swallows, and 15 hours of logging over three days.
Fig 6.
(A) Network constructed from 975 contacts between tagged barn swallows where logs had maximum RSSI values ≥ 0 = proximity < 5m (edges scaled to 1/5). (B) Network constructed from 88 contacts between tagged barn swallows where logs had maximum RSSI values ≥ 40 = proximity < 0.1m.
In both cases, n = 17 tagged barn swallows with females in white and males in gray. Data are from 15 hours of logging over three days. Node labels correspond to the bird’s tag ID.
Fig 7.
Reciprocal agreement in logs from all tags recording dyadic interactions.
RSSI = received signal strength indicator values. n = 733 logs from n = 17 tagged barn swallows from all recorded logs over five days.
Table 1.
Differences in maximum, minimum and mean RSSI and duration logged by both tags for all dyadic pairs.