Zigzag Heron (Zebrilus undulatus) Science Article 4
The only recent field observations reported for the poorly known Zigzag Heron (Zebrilus undulutus) (Hancock and Kushlan, Herons Handbook, Croom Helm, London, 1984) are those of Davis et al. (Condor 82:460-46 1, 198 1). Here we report on a bird watched intermittently by NJCM for about 13 h between 8 and 30 August 1985 at an oxbow lake with open swamp forest in the Tambopata Nature Reserve (12’49′S, 69′l S’W) near Puerto Maldonado, Madre de Dios Department, Peru. Its primaries were slatey-black as described by Blake (Manual of Neotropical Birds, University of Chicago Press, Chicago, 1977) and not noticeably blue as shown in Haverschmidt (Birds of Surinam, Oliver & Boyd, Edinburgh, 1968). Its posture resembled that shown by Haverschmidt (1968) and Davis et al. (198 1) more accurately than that illustrated by Hancock and Kushlan (1984).
Nigel J. C. Mathews & K. Brooke, Wilson Bull., 100(l), 1988, pp. 147-148