How can parasites control the behavior of there hosts?

Question: How can parasites control the behavior of there hosts?
- Keywords:
  human body,
  parasite
Asked by Conor Mcsweeny to Maureen on 12 Nov 2018. This question was also asked by bacon and cabbage.
- Maureen answered on 12 Nov 2018:
  
  That’s an excellent question! Some parasites use chemicals to control their hosts, like Toxoplasma, which makes rats run TOWARDS cat pee (https://en.wikipedia.org/wiki/Toxoplasma_gondii). Some parasites physically pull their hosts’ muscles, like Ophiocordyceps (https://www.theatlantic.com/science/archive/2017/11/how-the-zombie-fungus-takes-over-ants-bodies-to-control-their-minds/545864/).

Question: How can parasites control the behavior of there hosts?