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Sentinel behaviour has been widely described, but whether or not it is coordinated among group members requires careful examination. The Smooth-billed Ani, Crotophaga ani, a joint-nesting cooperatively breeding bird, appears to have a sentinel system; however, it is unknown whether that vigilance is coordinated, the defining feature of sentinel behaviour. We followed social groups during two breeding...
Intra‐brood competition can influence a variety of fitness‐related traits in birds. Previous research on the joint‐nesting Pūkeko Porphyrio melanotus melanotus, a New Zealand subspecies of Australasian Swamphen, showed that chicks that hatched earlier in a brood tended to grow faster, were more likely to survive and had higher dominance status as adults than later hatched nest‐mates. However, this...
Parasites can have profound effects on host behaviour and species interactions, but the consequences of these impacts are inadequately understood. Three common crayfish in northern Wisconsin and Michigan (native Orconectes virilis, non‐native O. propinquus and non‐native and invasive O. rusticus) are intermediate hosts for trematode parasites, Microphallus spp. Some species in the genus Microphallus...
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