Video: The Harvestmen Flash Mob Defense
Lesson #14110
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The Harvestmen Flash Mob Defense
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Gebruik één voornaam zonder spaties. Gebruik zo nodig bijvoorbeeld SamB.1. Harvestmen are best known for having tiny bodies and extremely long legs.
2. Leg autotomy involves the automatic of a harvestman’s own leg. (afwerpen / losmaken (0:23))
3. Which two special defenses are mentioned?
4. Harvestmen often gather in humid and poorly lit places during the day.
5. Some species form dense containing thousands of individuals. (verzamelingen / opeenhopingen (1:02))
6. What is the largest number of harvestmen mentioned in a mass aggregation?
7. The harvestmen in these groups are usually close relatives.
8. The cooperation between individuals cannot be explained by . (verwantschap / familieband (2:05))
9. What shows that these defensive groups are not based on family structure?
10. A disturbance can cause bobbing to spread through an entire cluster.
11. The movement through the group when one or more individuals are disturbed. (verspreidt zich / plant zich voort (2:30))
12. Why might bobbing be dangerous for an isolated harvestman?
13. Harvestmen in larger groups are more likely to bob and continue the behavior for a longer . (duur / tijdsduur (3:38))
14. Experiments showed that isolated harvestmen bobbed more frequently than grouped individuals.
15. Why might an individual continue bobbing while the rest of its group is moving?
16. Scientists are certain that the chemicals released by harvestmen only discourage predators.
17. The purpose of the volatile chemical compounds remains genuinely . (omstreden / betwist (4:21))
18. How do harvestmen encourage others to return to a particular location?
19. Researchers have identified special environmental features that explain why harvestmen select these locations.
20. The repeated chemical marking causes pheromones to at the chosen location. (zich ophopen / verzamelen (5:01))
21. What remains unknown about harvestmen aggregations?
22. Why might living in a large group be both an advantage and a disadvantage for harvestmen?
23. The bobbing defense only appears effective when many individuals participate. Does this count as cooperation even though the animals are unrelated?
24. Why is experimental research necessary before scientists can conclude that a particular behavior protects an animal?