34

Robinson, S.R. (1980). Antipredator behaviour and predator recognition in Belding's ground squirrels. Anim.
Behav. 28:840-852.
Robinson, S.R. (1981). Alarm communication in Belding's ground squirrels. Z. Tierpsychol . 56:150-168. Rosenthal, G.G., Evans, C.S., and Miller, W.L. (1996). Female preference for dynamic traits in the green
swordtail, Xiphophorus helleri . Anim. Behav. 51:811-820.
Rowell, T.E., and Hinde, R.A. (1962). Vocal communication by the rhesus monkey (Macaca mulatta ).
Proc. Zool. Soc. Lond. 138:279-294.
Rowland, W.J., Bolyard, K.J., and Halpern, A.D. (1995a). The dual effect of stickleback nuptial coloration on
rivals: Manipulation of a graded signal using video playback. Anim. Behav. 50:267-272. Rowland, W.J., Bolyard, K.J., Jenkins, J.J., and Fowler, J. (1995b).Video playback experiments on stickleback
mate choice: Female motivation and attentiveness to male colour cues. Anim. Behav. 49:1559-1567. Ryan, M.J., and Rand, A.S. (1993). Sexual selection and signal evolution: The ghost of biases past.
Phil. Trans. R. Soc. Lond. B. 340:187-195.
Ryan, M.J., Fox, J.H., Wilczynski, W., and Rand, A.S. (1990). Sexual selection for sensory exploitation in
the frog Physalaemus pustulosus . Nature 343:66-67.
Schjelderup-Ebbe, T. (1922). Beiträge zur Sozialpsychologie des Haushuhnes. Z. Tierpsychol. 88:225-252. Schleidt, W.M. (1973). Tonic communication: Continual effects of discrete signs in animal communication
systems. J. theoret. Biol. 42:359-386.
Schull, J., and Smith, J.D. (1992). Knowing thyself, knowing the other: They're not the same. Behav. Brain
Sci.  15:166-167.
Seyfarth, R.M., and Cheney, D.L. (1980). The ontogeny of vervet monkey alarm calling behavior: A
preliminary report. Z. Tierpsychol. 54:37-56.
Seyfarth, R.M., and Cheney, D.L. (1990). The assessment by vervet monkeys of their own and another species'
alarm calls. Anim. Behav . 40:754-764.
Seyfarth, R.M., and Cheney, D.L. (1992). Meaning and mind in monkeys. Sci. Am. 267:122-128. Seyfarth, R.M., and Cheney, D.L. (1993). Meaning, reference, and intentionality in the natural vocalizations
of monkeys. In Roitblat, H.L., Herman, L.M., and Nachtigall, P.E. (eds.), Language and
communication: Comparative perspectives. , Erlbaum, Hillsdale, New Jersey, pp. 195-219. Seyfarth, R.M., Cheney, D.L., and Marler, P. (1980a). Vervet monkey alarm calls: Semantic communication in
a free-ranging primate. Anim. Behav. 28:1070-1094.
Seyfarth, R.M., Cheney, D.L., and Marler, P. (1980b). Monkey responses to three different alarm calls:
Evidence of predator classification and semantic communication. Science 210:801-803. Sherman, P.W. (1977). Nepotism and the evolution of alarm calls. Science 197:1246-1253. Sherman, P.W. (1985). Alarm calls of Belding's ground squirrels to aerial predators: Nepotism or self-
preservation? Behav. Ecol. Sociobiol. 17:313-323.
Smith, W.J. (1965). Message, meaning and context in ethology. Am. Nat. 99:405-409. Smith, W.J. (1977). The behavior of communicating. Harvard University Press, Cambridge, Massachusetts. Smith, W.J. (1981). Referents of animal communication. Anim. Behav. 29:1273-1274. Smith, W.J. (1991). Animal communication and the study of cognition. In Ristau, C.A. (ed.), Cognitive
ethology: The minds of other animals , Erlbaum, Hillsdale, New Jersey, pp. 209-230. Snowdon, C.T. (1990). Language capacities of nonhuman animals. Yearbook of Physical Anthropology
 33:215-243.
Snowdon, C.T. (1992). The sounds of silence. Behav. Brain Sci. 15:167-168.
Snowdon, C.T. (1993a). Linguistic phenomena in the natural communication of animals. In Roitblat, H.L.,
Herman, L.M., and Nachtigall, P.E. (eds.), Language and communication: Comparative perspectives ,
Erlbaum, Hillsdale, New Jersey, pp. 175-194.
Snowdon, C.T. (1993b) A comparative approach to language parallels. In Gibson, K.R. and Ingold, T. (eds.),
Tools, language and cognition in human evolution , Cambridge University Press, London, pp. 109-128. Snowdon, C.T., Coe, C.L., and Hodun, A. (1985). Population recognition of infant isolation peeps in the
squirrel monkey. Anim. Behav. 33:1145-1151.
Stamps, J.A. (1991). Why evolutionary issues are reviving interest in proximate behavioral mechanisms.
Am. Zool. 31:338-348.
Struhsaker, T.T. (1967). Auditory communication among vervet monkeys (Cercopithecus aethiops ). In
Altmann, S.A. (ed.), Social communication among primates , University of Chicago Press, Chicago,
pp. 281-324.
Sullivan, K.A. (1985). Selective alarm calling by downy woodpeckers in mixed-species flocks. Auk
 102:184-187.
Swets, J.A. (1961). Is there a sensory threshold? Science 134:168-177.
Tattersall, I. (1982). The primates of Madagascar. Columbia University Press, New York. Tinbergen, N. (1948). Social releasers and the experimental method required for their study. Wilson Bull.
 60:6-51.
Trail, P.W. (1987). Predation and antipredator behavior of Guianan cock-of-the-Rock leks. Auk 104:496-507.