| 11. | In some species of planarians, sexual behaviour takes the form of penis fencing.
|
| 12. | Some may even feed on other land planarians.
|
| 13. | Some land planarians show hunting behaviour, using chemical signals to detect their prey.
|
| 14. | Some studies have begun the investigation of the evolutionary ecology of these invasive planarians.
|
| 15. | From 1980 on he also started to work on the biology of land planarians.
|
| 16. | Planarians are famous for their ability to regenerate if divided by cuts across their bodies.
|
| 17. | For example, a planarian split lengthwise or crosswise will regenerate into two separate individuals.
|
| 18. | Similar invasions of other terrestrial planarians are occurring in many other parts of the world.
|
| 19. | Land planarians are carnivorous and most species are active predators, but some are mainly scavengers.
|
| 20. | All planarians are hermaphrodites, so their reproductive system has a male and a female part.
|
