Please answer the following question: What type of details about gustav jäger -lrb- naturalist -rrb-  can be gathered from the following bio?  Bio: gustav jäger -lrb- june 23 , 1832 -- may 13 , 1917 -rrb- was a german naturalist and hygienist .
Answer:
- death place - caption - death date - field - birth date - nationality - image - birth place