Kathelijne Koops
Biographic Data
| ID | 1767789 |
|---|---|
| NAME | Kathelijne Koops |
| GIVEN NAMES | Kathelijne |
| FAMILY NAME | Koops |
| SIGNATURE | KOOPS K |
| AFFILIATIONS | University of Zurich |
| ORCID | 0000-0001-7097-2698 |
| VERIFIED | Yes |
| TOTAL WORKS | 21 |
| TOTAL CITATIONS | 44 |
| AUTHOR COUNT | 21 |
| EDITOR COUNT | 0 |
| FIRST PUBLICATION YEAR | 2007 |
| LATEST PUBLICATION YEAR | 2026 |
| H-INDEX | 4 |
The Tool Systems Approach
Measuring technological complexity across species, as well as across temporal and spatial scales, is an ongoing challenge among authors who work on primatological, archaeological, and/or ethnographic questions. Researchers in these individual fields have developed a number of innovative ways of approaching this issue that reflect the specific affordances of their data with a known set of limitations. However, comparability between these approache…
Selectivity in Buttress Drumming Tree Properties Among Chimpanzees ( Pan troglodytes schweinfurthii ) of the Waibira Community in Budongo Forest, Uganda
Wild chimpanzees drum on tree buttresses during dominance displays and travel, generating low‐frequency sounds that are audible over distances of more than 1 km. Western chimpanzees ( Pan troglodytes verus ) in the Nimba Mountains of Guinea selectively choose trees and buttresses when drumming, potentially based on their resonant properties, suggesting that these chimpanzees are optimizing their drumming signals. We investigated whether male east…
Genital Wounding in Chimpanzees (Pan troglodytes)
Object play in Tsimane children
Sex-specific division of labour and the associated use of different subsistence techniques by males (e.g. hunting) and females (e.g. gathering) has played an important role in shaping human societies. Skills needed in adulthood are practiced in play during childhood and object play has been proposed to foster tool-use skills necessary for adult subsistence techniques. Here, we investigated sex differences in the ontogeny of object play in Tsimane…
Flexible grouping patterns in a western and eastern chimpanzee community
Primate social organizations, or grouping patterns, vary significantly across species. Behavioral strategies that allow for flexibility in grouping patterns offer a means to reduce the costs of group living. Chimpanzees ( Pan troglodytes ) have a fission‐fusion social system in which temporary subgroups (“parties”) change in composition because of local socio‐ecological conditions. Notably, western chimpanzees ( P. t. verus ) are described as sho…
To drum or not to drum
Chimpanzees live in fission‐fusion social organizations, which means that party size, composition, and spatial distribution are constantly in flux. Moreover, chimpanzees use a remarkably extensive repertoire of vocal and nonvocal forms of communication, thought to help convey information in such a socially and spatially dynamic setting. One proposed form of nonvocal communication in chimpanzees is buttress drumming, in which an individual hits a …
Field experiments find no evidence that chimpanzee nut cracking can be independently innovated
Open‐access platform to synthesize knowledge of ape conservation across sites
Despite the large body of literature on ape conservation, much of the data needed for evidence‐based conservation decision‐making is still not readily accessible and standardized, rendering cross‐site comparison difficult. To support knowledge synthesis and to complement the IUCN SSC Ape Populations, Environments and Surveys database, we created the A.P.E.S. Wiki ( https://apeswiki.eva.mpg.de ), an open‐access platform providing site‐level inform…
Quantifying gaze conspicuousness
How to measure chimpanzee party size? A methodological comparison
Chimpanzee termite fishing etiquette
Crab-fishing by chimpanzees in the Nimba Mountains, Guinea
The significance of aquatic food resources for hominins is poorly understood, despite evidence of consumption as early as 1.95 million years ago (Ma). Here we present the first evidence of a non-human ape habitually catching and consuming aquatic crabs. Chimpanzees (Pan troglodytes verus) in the rainforest of the Nimba Mountains (Guinea) consumed freshwater crabs year-round, irrespective of rainfall or ripe fruit availability. Parties of females …
Modeling habitat suitability for chimpanzees (Pan troglodytes verus) in the Greater Nimba Landscape, Guinea, West Africa
First records of tool-set use for ant-dipping by Eastern chimpanzees (Pan troglodytes schweinfurthii) in the Kalinzu Forest Reserve, Uganda
Chimpanzees prey on army ants at Seringbara, Nimba Mountains, Guinea
Chimpanzees are renowned for their use of foraging tools in harvesting social insects and some populations use tools to prey on aggressive army ants (Dorylus spp.). Tool use in army ant predation varies across chimpanzee study sites with differences in tool length, harvesting technique, and army ant species targeted. However, surprisingly little is known about the detailed ecology of army ant predation. We studied army ant predation by chimpanzee…
Lethal aggression in Pan is better explained by adaptive strategies than human impacts
Nest-Building by Chimpanzees (Pan troglodytes verus) at Seringbara, Nimba Mountains
Terrestrial nest‐building by wild chimpanzees ( Pan troglodytes )
Nest‐building is a great ape universal and arboreal nesting in chimpanzees and bonobos suggests that the common ancestor of Pan and Homo also nested in trees. It has been proposed that arboreal nest‐building remained the prevailing pattern until Homo erectus , a fully terrestrial biped, emerged. We investigated the unusual occurrence of ground‐nesting in chimpanzees ( Pan troglodytes ), which may inform on factors influencing the tree‐to‐ground s…
Do chimpanzees (Pan troglodytes) use cleavers and anvils to fracture Treculia africana fruits? Preliminary data on a new form of percussive technology
Ground‐nesting by the chimpanzees of the Nimba Mountains, Guinea
The chimpanzees ( Pan troglodytes verus ) of the Nimba Mountains, Guinea, West Africa, commonly make both elaborate (“night”) and simple (“day”) nests on the ground. In this study we investigated which factors might influence ground‐nesting in this population, and tested two ecological hypotheses: 1) climatic conditions, such as high wind speeds at high altitudes, may deter chimpanzees from nesting in trees; and 2) a lack of appropriate arboreal …
Reconciliation, relationship quality, and postconflict anxiety
Reconciliation is a conflict resolution mechanism that is common to many gregarious species with individualized societies. Reconciliation repairs the damaged relationship between the opponents and decreases postconflict (PC) anxiety. The “integrated hypothesis” links the quality of the opponents' relationship to PC anxiety, since it proposes that conflicts among partners with high relationship quality will yield high levels of PC anxiety, which i…
Nest-Building by Chimpanzees (Pan troglodytes verus) at Seringbara, Nimba Mountains
Terrestrial nest‐building by wild chimpanzees ( Pan troglodytes )
Nest‐building is a great ape universal and arboreal nesting in chimpanzees and bonobos suggests that the common ancestor of Pan and Homo also nested in trees. It has been proposed that arboreal nest‐building remained the prevailing pattern until Homo erectus , a fully terrestrial biped, emerged. We investigated the unusual occurrence of ground‐nesting in chimpanzees ( Pan troglodytes ), which may inform on factors influencing the tree‐to‐ground s…
Crab-fishing by chimpanzees in the Nimba Mountains, Guinea
The significance of aquatic food resources for hominins is poorly understood, despite evidence of consumption as early as 1.95 million years ago (Ma). Here we present the first evidence of a non-human ape habitually catching and consuming aquatic crabs. Chimpanzees (Pan troglodytes verus) in the rainforest of the Nimba Mountains (Guinea) consumed freshwater crabs year-round, irrespective of rainfall or ripe fruit availability. Parties of females …
Field experiments find no evidence that chimpanzee nut cracking can be independently innovated
Quantifying gaze conspicuousness
Chimpanzee termite fishing etiquette
Ground‐nesting by the chimpanzees of the Nimba Mountains, Guinea
The chimpanzees ( Pan troglodytes verus ) of the Nimba Mountains, Guinea, West Africa, commonly make both elaborate (“night”) and simple (“day”) nests on the ground. In this study we investigated which factors might influence ground‐nesting in this population, and tested two ecological hypotheses: 1) climatic conditions, such as high wind speeds at high altitudes, may deter chimpanzees from nesting in trees; and 2) a lack of appropriate arboreal …
Reconciliation, relationship quality, and postconflict anxiety
Reconciliation is a conflict resolution mechanism that is common to many gregarious species with individualized societies. Reconciliation repairs the damaged relationship between the opponents and decreases postconflict (PC) anxiety. The “integrated hypothesis” links the quality of the opponents' relationship to PC anxiety, since it proposes that conflicts among partners with high relationship quality will yield high levels of PC anxiety, which i…
Do chimpanzees (Pan troglodytes) use cleavers and anvils to fracture Treculia africana fruits? Preliminary data on a new form of percussive technology
Nest-Building by Chimpanzees (Pan troglodytes verus) at Seringbara, Nimba Mountains
Terrestrial nest‐building by wild chimpanzees ( Pan troglodytes )
Nest‐building is a great ape universal and arboreal nesting in chimpanzees and bonobos suggests that the common ancestor of Pan and Homo also nested in trees. It has been proposed that arboreal nest‐building remained the prevailing pattern until Homo erectus , a fully terrestrial biped, emerged. We investigated the unusual occurrence of ground‐nesting in chimpanzees ( Pan troglodytes ), which may inform on factors influencing the tree‐to‐ground s…
Lethal aggression in Pan is better explained by adaptive strategies than human impacts
First records of tool-set use for ant-dipping by Eastern chimpanzees (Pan troglodytes schweinfurthii) in the Kalinzu Forest Reserve, Uganda
Chimpanzees prey on army ants at Seringbara, Nimba Mountains, Guinea
Chimpanzees are renowned for their use of foraging tools in harvesting social insects and some populations use tools to prey on aggressive army ants (Dorylus spp.). Tool use in army ant predation varies across chimpanzee study sites with differences in tool length, harvesting technique, and army ant species targeted. However, surprisingly little is known about the detailed ecology of army ant predation. We studied army ant predation by chimpanzee…
Modeling habitat suitability for chimpanzees (Pan troglodytes verus) in the Greater Nimba Landscape, Guinea, West Africa
Crab-fishing by chimpanzees in the Nimba Mountains, Guinea
The significance of aquatic food resources for hominins is poorly understood, despite evidence of consumption as early as 1.95 million years ago (Ma). Here we present the first evidence of a non-human ape habitually catching and consuming aquatic crabs. Chimpanzees (Pan troglodytes verus) in the rainforest of the Nimba Mountains (Guinea) consumed freshwater crabs year-round, irrespective of rainfall or ripe fruit availability. Parties of females …
How to measure chimpanzee party size? A methodological comparison
Chimpanzee termite fishing etiquette
Open‐access platform to synthesize knowledge of ape conservation across sites
Despite the large body of literature on ape conservation, much of the data needed for evidence‐based conservation decision‐making is still not readily accessible and standardized, rendering cross‐site comparison difficult. To support knowledge synthesis and to complement the IUCN SSC Ape Populations, Environments and Surveys database, we created the A.P.E.S. Wiki ( https://apeswiki.eva.mpg.de ), an open‐access platform providing site‐level inform…
Quantifying gaze conspicuousness
To drum or not to drum
Chimpanzees live in fission‐fusion social organizations, which means that party size, composition, and spatial distribution are constantly in flux. Moreover, chimpanzees use a remarkably extensive repertoire of vocal and nonvocal forms of communication, thought to help convey information in such a socially and spatially dynamic setting. One proposed form of nonvocal communication in chimpanzees is buttress drumming, in which an individual hits a …
Field experiments find no evidence that chimpanzee nut cracking can be independently innovated
Flexible grouping patterns in a western and eastern chimpanzee community
Primate social organizations, or grouping patterns, vary significantly across species. Behavioral strategies that allow for flexibility in grouping patterns offer a means to reduce the costs of group living. Chimpanzees ( Pan troglodytes ) have a fission‐fusion social system in which temporary subgroups (“parties”) change in composition because of local socio‐ecological conditions. Notably, western chimpanzees ( P. t. verus ) are described as sho…
Selectivity in Buttress Drumming Tree Properties Among Chimpanzees ( Pan troglodytes schweinfurthii ) of the Waibira Community in Budongo Forest, Uganda
Wild chimpanzees drum on tree buttresses during dominance displays and travel, generating low‐frequency sounds that are audible over distances of more than 1 km. Western chimpanzees ( Pan troglodytes verus ) in the Nimba Mountains of Guinea selectively choose trees and buttresses when drumming, potentially based on their resonant properties, suggesting that these chimpanzees are optimizing their drumming signals. We investigated whether male east…
Genital Wounding in Chimpanzees (Pan troglodytes)
Object play in Tsimane children
Sex-specific division of labour and the associated use of different subsistence techniques by males (e.g. hunting) and females (e.g. gathering) has played an important role in shaping human societies. Skills needed in adulthood are practiced in play during childhood and object play has been proposed to foster tool-use skills necessary for adult subsistence techniques. Here, we investigated sex differences in the ontogeny of object play in Tsimane…
The Tool Systems Approach
Measuring technological complexity across species, as well as across temporal and spatial scales, is an ongoing challenge among authors who work on primatological, archaeological, and/or ethnographic questions. Researchers in these individual fields have developed a number of innovative ways of approaching this issue that reflect the specific affordances of their data with a known set of limitations. However, comparability between these approache…
Primate Behavior and Ecology (18 works) · Biology (17 works) · Animal Vocal Communication and Behavior (13 works) · Troglodytes (13 works) · Geography (12 works) · Animal Behavior and Reproduction (11 works) · Ecology (11 works) · Animal ecology (6 works) · Ecology (6 works) · Habitat (5 works)