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Small population sizes put a species at extreme risk of extinction due to a lack of variation, and a consequent decrease in adaptability. This weakens the chances of survival under pressures such as climate change, competition from other species, or new diseases. Large populations are more likely to survive pressures such as these, as such populations are more likely to harbor individuals that have genetic variants that are adaptive under new stresses. Small populations are much less...
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There have been five major extinction events throughout geological history, resulting in the elimination of biodiversity, followed by a rebound of species that adapted to the new conditions. In the current geological epoch, the Holocene, there is a sixth extinction event in progress. This mass extinction has been attributed to human activities and is thus provisionally called the Anthropocene. In 2019 the human population reached 7.7 billion people and is projected to comprise 10 billion by...
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Related Experiment Video

Updated: Apr 8, 2026

Spotting Cheetahs: Identifying Individuals by Their Footprints
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Two fatal tiger attacks in zoos.

Britta Tantius1, Daniel Wittschieber2, Sven Schmidt2

  • 1Institute of Legal Medicine, Medical Faculty, University of Cologne, Melatenguertel 60/62, 50823, Cologne, Germany.

International Journal of Legal Medicine
|June 28, 2015
PubMed
Summary
This summary is machine-generated.

Two fatal tiger attacks in zoos resulted from handlers entering enclosures during cleaning, leading to territorial defense by tigers. Human error was cited, but investigations varied, with one zoo director initially charged with negligence.

Keywords:
Animal attackBig catSpinal injuryTiger biteWork fatality

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Area of Science:

  • Veterinary Medicine
  • Animal Behavior

Background:

  • Analysis of two fatal captive tiger attacks in German zoos (Cologne and Münster).
  • Attacks occurred during routine enclosure cleaning when handlers entered while tigers retained access.

Observation:

  • Tigers defended their territory against perceived intruders (handlers).
  • Both victims sustained fatal neck injuries from tiger bites.
  • Intervention at Münster involved luring the tiger away; at Cologne, the tiger was euthanized.

Findings:

  • Human error was identified as the cause of the zookeepers' deaths.
  • Münster investigation closed due to no third-party fault.
  • Cologne investigation: Director initially charged with negligence, later dismissed due to updated safety regulations.

Implications:

  • Highlights critical safety protocols in captive big cat management.
  • Underscores the importance of understanding animal territorial behavior in zoo environments.
  • Reinforces the need for rigorous safety assessments and adherence to regulations in zoological facilities.