Can an Animal Eat a Mountain Gorillas
journal article
Behaviour
Published By: Brill
https://www. jstor .org/stable/4535837
Mountain gorillas use elaborate, multi-stage procedures for dealing with plant defences. This paper investigates the use of mathematically-inspired, informational measures to gauge the complexity of one of these tasks, eating thistle Carduus nyassanus, from field observations of 38 adults and juveniles. Behaviour was analysed at two levels, a detailed, movement-based description of the form of actions, and an organizational description of techniques that were composed of a series of many actions. Complexity, as measured by counting the sizes of behavioural repertoires, correlated at the two levels. Repertoires were shown to be incomplete, but the rates of cumulative increase in actions differed between tasks. Thistle eating was the most complex, and apparently involved many more actions than even chimpanzee tool-use. Techniques were highly selective arrangements of actions, so that their organization (sequence, bimanual coordination, hierarchical structure) reflected cognitive capacity. Although ideally it would preferable to estimate complexity of task organization, this may seldom be feasible, and was not in this case. Instead, the length of a regularly occurring sequence of actions may be the best practical estimate of an underlying complexity of mental process. Confidence in this measure will be increased if it broadly agrees with other, independent estimates of task complexity; in the case of gorilla plant processing, both the size of repertoire of functionally distinct actions and the degree of lateral specialization were, like sequence length, greater for thistle processing than for other tasks studied to date.
Behaviour publishes original research pursuing Tinbergen's four questions and questions resulting from the interrelationship among the four. In addition, the editorial board encourages reviews of behavioural biology that illuminate emergent trends and new directions in behavioural research. Niko Tinbergen (1907-1988) defined 4 questions for research in behavioral biology: Proximate causation of behaviour: 1. How does an animal use its sensory and motor abilities to activate and modify its behaviour patterns? (physiological mechanisms) 2. How does an animal's behaviour change during its growth, especially in response to the experiences that it has while maturing? (ontogeny of development) Ultimate causation of behaviour: 3. How does the behaviour promote an animal's ability to survive and reproduce? (adaptation) 4. How does an animal's behaviour compare with that of other closely related species, and what does this tell us about the origins of its behavior and the changes that have occurred during the history of the species? (phylogeny) Niko Tinbergen shared, with Konrad Lorenz and Karl von Frisch, the 1973 Nobel Prize for Medicine or Physiology for contributions to the study of behavioural biology. Tinbergen was at heart an experimentalist who, more than Lorenz and von Frisch, applied the scientific method to the field of animal and human behaviour. It is his experimental approach to the study of behaviour that lasts to this day. That is why Tinbergen listed questions and not answers (theorems or laws). The answers (or at least some of them) are published monthly in Behaviour, the journal Tinbergen co-founded with W. H. Thorpe in 1948.
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Can an Animal Eat a Mountain Gorillas
Source: https://www.jstor.org/stable/4535837
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