Results 151 to 160 of about 5,662 (194)

The stone tools of capuchins (Cebus apella) [PDF]

International Journal of Primatology, 1995
We examined the production of stone took by capuchins (Cebus apella). Eleven subjects used five reduction techniques to produce 346 stone tools (48 cores and 298 flakes). They produced a sharp edge on 83% of the cores and largest flakes. Three monkeys later used a sample of these objects as cutting tools.
Gregory Charles Westergaard
exaly   +2 more sources

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Chromosome studies of Cebus apella: The standard karyotype of Cebus apella paraguayanus, Fischer, 1829

American Journal of Primatology, 1986
AbstractChromosome studies were performed on 40 specimens identified as Cebus apella paraguayanus, Fischer, 1829, which had been wild‐caught in Santa Catalina (Republic of Paraguay). Elongated chromosome spreads obtained from lymphocyte cultures were sequentially stained with different techniques, and a constant pattern of 382 bands was identified in ...
Tetsuji, Matayoshi, Edgardo, Howlin, Nora, Nasazzi, Carlos, Nagle, Enrique, Gadow, Héctor N, Seuánez   +5 more
openaire   +2 more sources

The meiotic chromosomes of Cebus apella (Cebidae, Platyrrhini)

Cytogenetics and Cell Genetics, 2008
An analysis of the meiotic chromosomes of Cebus apella (Cebidae, Platyrrhini) has allowed for the visualization of constitutive heterochromatic regions throughout the meiotic cycle and has permitted the identification of four chromosomes in the first and the second divisions.
H N, Seuánez, J L, Armada, C, Barroso, C, Rezende, V F, da Silva   +4 more
openaire   +2 more sources

Joystick acquisition in tufted capuchins ( Cebus apella )

Animal Cognition, 2003
A number of nonhuman primate species have demonstrated the ability to use a joystick to control a cursor on a computer screen, yet the acquisition of this skill has not been the focus of systematic inquiry. Here, we examined joystick acquisition in four tufted capuchins under two directional relationships of joystick movement and resultant cursor ...
Katherine A, Leighty, Dorothy M, Fragaszy   +1 more
openaire   +2 more sources

Multifocal Candidiasis in a Capuchin Monkey ( Cebus apella)

Journal of Medical Primatology, 1977
Candidiasis involving nasal, pharyngeal, and intestinal mucosal surfaces and a pharyngeal lymph node was demonstrated microscopically in a young adult female capuchin monkey (Cebus apella) experimentally infected with Schistosoma haematobium (Iran strain).
B, McCullough, J, Moore, R E, Kuntz
openaire   +2 more sources

Posture and Reaching in Tufted Capuchins (Cebus apella)

Laterality, 1997
This research investigated the effects of posture on lateral bias for food reaching in tufted capuchin monkeys ( Cebus apella ) by comparing hand preferences for quadrupedal and bipedal reaching. Several findings of this investigation warrant discussion.
G C, Westergaard, H E, Kuhn, A L, Lundquist, S J, Suomi   +3 more
openaire   +2 more sources

Working memory in capuchin monkeys (Cebus apella)

Behavioural Brain Research, 2002
It has been suggested that delayed (non-) matching to sample (DNMTS/DMTS) tasks using trial-unique stimuli and short, as well as longer delay intervals, can provide important insights into animal cognition. Therefore, this research examined the capability of the New World capuchin monkey (Cebus apella) in perform trial-unique DMTS and DNMTS tasks ...
Maria Clotilde H, Tavares, Carlos, Tomaz
openaire   +2 more sources

Transfer pathways between the ovaries and the uterus in the cebus monkeys (Cebus apella)

General and Comparative Endocrinology, 2005
The aim of this work was to study, in the Cebus apella monkey, the developmental changes in the microanatomy of the utero-ovarian ligament (UOL) and whether their vascular and neural elements might be involved in the transfer of signals between the ovaries and uterus. Sections including uterus, UOL, and ovary obtained from two foetuses, two prepubertal,
Carlos A, Nagle, Armando F, Mendizábal, Mónica M, Lahoz, Maria M, Porta, Marta I, Torres   +4 more
openaire   +2 more sources

Metamemory in tufted capuchin monkeys (Cebus apella)

Animal Cognition, 2009
Whereas evidence for metacognition by nonhuman primates has been obtained in great apes and old world monkeys, it is weaker in new world monkeys. For instance, capuchin monkeys may fail to recognize their own knowledge of the location of invisible bait. In the present study, we tested whether tufted capuchin monkeys would flexibly change their behavior
openaire   +2 more sources

Coping with Acute Crowding by Cebus apella

International Journal of Primatology, 2006
Traditionally, scientists believed that crowded housing conditions increased aggression in animals. Recent research on captive primates fails to support a linear relationship between population density and aggressive behavior. Our study is the first to investigate the effects of acute crowding on a New World primate.
Megan L. van Wolkenten, Jason M. Davis, May Lee Gong, Frans B. M. de Waal   +3 more
openaire   +1 more source