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Giraffes make decisions based on statistical information.

Alvaro L Caicoya1,2, Montserrat Colell1,2, Federica Amici3,4

  • 1Department of Clinical Psychology and Psychobiology, Faculty of Psychology, University of Barcelona, Barcelona, Spain.

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Giraffes demonstrate statistical inference capabilities, successfully choosing food options based on relative frequencies. This study reveals cognitive abilities in giraffes previously observed only in animals with larger relative brain sizes.

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Area of Science:

  • Cognitive Ethology
  • Animal Behavior
  • Comparative Psychology

Background:

  • Statistical inference has been primarily studied in animals with large relative brain sizes, such as primates and parrots.
  • The cognitive abilities of giraffes (Giraffa camelopardalis), particularly regarding statistical reasoning, remain largely unexplored.
  • Understanding decision-making processes in diverse species enhances our knowledge of cognitive evolution.

Purpose of the Study:

  • To investigate whether giraffes can make statistical inferences based on relative frequencies to predict sampling outcomes.
  • To determine if giraffes integrate visual and quantity information for probabilistic decision-making.
  • To assess the capacity for statistical reasoning in animals with smaller relative brain sizes.

Main Methods:

  • Giraffes were presented with two transparent containers holding varying quantities of preferred and less-preferred food items.
  • Tasks involved manipulating the relative frequencies of food types and introducing physical barriers to assess information integration.
  • Choice behavior was analyzed to determine if giraffes selected containers with a higher probability of yielding preferred food.

Main Results:

  • Giraffes successfully chose the container more likely to yield highly-liked food in both experimental tasks.
  • The animals demonstrated the ability to integrate visual cues and relative frequencies to make probabilistic predictions.
  • Results ruled out simpler heuristics like quantity bias and associative learning as explanations for the observed behavior.

Conclusions:

  • Giraffes possess the cognitive ability to make decisions based on statistical inferences, challenging previous assumptions about the link between relative brain size and such abilities.
  • This study expands our understanding of cognitive complexity in large mammals and highlights the importance of comparative research.
  • The findings suggest that statistical reasoning may be more widespread across the animal kingdom than previously thought.