Fig. 2.
Design of behavioral experiment. Bird 1128 is represented by black circles. White and tan circles represent ZAL2/2m (WS) birds and ZAL2/2 (TS) birds, respectively. Each line connecting two circles represents a single behavioral trial, 3 h in duration, between those two birds. Trials with Bird 1128 are indicated by black lines. WS–WS and TS–TS trials are indicated by gray and tan lines, respectively. Under short days (a), Bird 1128 was paired with 3 WS and 3 TS opponents. Each of the WS and TS birds were sequentially paired with 3–4 opponents, which in some but not all cases included Bird 1128. On long days (b), Bird 1128 was paired with every other bird, and each WS and TS bird was paired with every other same-morph bird. Bird 1125 was unavailable for long-day trials