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Author Shuster, G.; Sherman, P.W. doi  openurl
  Title Tool use by naked mole-rats Type Journal Article
  Year 1998 Publication Animal Cognition Abbreviated Journal Anim. Cogn.  
  Volume 1 Issue 1 Pages 71-74  
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  Abstract Naked mole-rats (Heterocephalus glaber, Rodentia: Bathyergidae) excavate extensive subterranean burrows with their procumbent incisors. Captive individuals often place a wood shaving or tuber husk behind their incisor teeth and in front of their lips and molar teeth while gnawing on substrates that yield fine particulate debris. This oral barrier may prevent choking or aspiration of foreign material. Consistent use of tools has rarely been reported in rodents.  
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  Call Number Equine Behaviour @ team @ Serial 3367  
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Author Hauber, M.E.; Sherman, P.W.; Paprika, D. doi  openurl
  Title Self-referent phenotype matching in a brood parasite: the armpit effect in brown-headed cowbirds (Molothrus ater) Type Journal Article
  Year 2000 Publication Animal Cognition Abbreviated Journal Anim. Cogn.  
  Volume 3 Issue 2 Pages 113-117  
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  Abstract Most birds and mammals learn characteristics of conspecifics from their parents and siblings. In interspecific brood parasites, however, early social learning could lead to species recognition errors because young are reared among heterospecifics. Conceivably, juvenile parasites might inspect and memorize aspects of their own phenotype, and later match features of encountered individuals to that template. We tested for such self-referent phenotype matching by manipulating feather colors of hand-reared fledglings (n = 21) of the parasitic brown-headed cowbird (Molothrus ater). In simultaneous choice trials (n = 6 trials/subject) between dyed and normal-colored adult females, juvenile cowbirds (< 2 months old) approached more quickly and associated preferentially with individuals that were colored similar to themselves. These preferences remained even when differences between the associative behaviors of juvenile males and females were controlled statistically. Our data imply that cowbirds incorporate their own plumage color into their recognition template. This provides the first evidence of self-referent phenotype matching through experimental manipulation of a recognition cue.  
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  Notes Approved no  
  Call Number Equine Behaviour @ team @ Serial 3309  
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Author Neff, B.D.; Sherman, P.W. doi  openurl
  Title Nestling recognition via direct cues by parental male bluegill sunfish ( Lepomis macrochirus) Type Journal Article
  Year 2003 Publication Animal Cognition Abbreviated Journal Anim. Cogn.  
  Volume 6 Issue 2 Pages 87-92  
  Keywords Animals; Animals, Wild; Male; Ovum; Parasites; Perception; *Perciformes; Pheromones; *Recognition (Psychology); Sexual Behavior, Animal; *Smell; Social Behavior  
  Abstract Parental care can be costly to a parent in terms of both time and energy invested in the young. In species with cuckoldry or brood parasitism not all of the young under a parent's care are necessarily offspring. In such cases, distinguishing between kin and non-kin, and investing only in the former (nepotism), can be advantageous. Bluegill sunfish ( Lepomis macrochirus) are characterized by paternal care and cuckoldry, and care-providing males appear to show nepotistic behaviours. Here, we investigated nestling recognition in bluegill, determining whether parental males can differentiate between young from their own nest (familiar and related) and young from non-neighbouring nests (unfamiliar and unrelated) using (1) visual and chemical cues, and (2) chemical cues only. In the first experiment, wild-caught parental males were presented with samples of eggs or fry (newly hatched eggs) collected from their own nest or a foreign nest and placed on opposite sides of an aquarium. The time these parental males spent associating with each sample, and their “pecking” behaviours (indicating cannibalism), were recorded. Parental males showed no preference between eggs from their own nest and eggs from a non-neighbouring nest, but they preferred to associate with fry from their own nest over foreign fry. There also was a positive relationship between male body size and the time spent associated with fry from their own nest. Parental males pecked at foreign fry more than 5 times as often as fry from their own nest, though this difference was not statistically significant. In the second experiment, fry that were collected from the nest of a wild-caught parental male or a non-neighbouring nest were placed in different containers and the water from each was dripped into opposite ends of an aquarium. The time the male spent on each side was recorded. In this case, parental males spent more time near the source of water conditioned by unrelated fry, but there was a positive relationship between male condition (fat reserves) and the time he spent near the source of water conditioned by fry from his own nest. Results confirm that chemicals cue nestling recognition by parental male bluegill.  
  Address Department of Biology, University of Western Ontario, London, ON N6A 5B7, Canada. bneff@uwo.ca  
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  ISSN 1435-9448 ISBN Medium  
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  Notes PMID:12687419 Approved no  
  Call Number Equine Behaviour @ team @ Serial 2577  
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Author Hauber, M.E.; Sherman, P.W. doi  openurl
  Title Designing and interpreting experimental tests of self-referent phenotype matching Type Journal Article
  Year 2003 Publication Animal Cognition Abbreviated Journal Anim. Cogn.  
  Volume 6 Issue 1 Pages 69-71  
  Keywords Animals; Birds; Body Constitution; Color; Humans; Pedigree; *Perception; Phenotype; *Recognition (Psychology); Research Design; *Self Psychology  
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  Address Department of Neurobiology and Behavior, Cornell University, Ithaca, NY 14853-2702, USA  
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  ISSN 1435-9448 ISBN Medium  
  Area Expedition Conference  
  Notes PMID:12658536 Approved no  
  Call Number Equine Behaviour @ team @ Serial 2580  
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