Pranciškus Baltrus Šivickis (born September 30, 1882, in the Raseiniai region of central Lithuania—died October 12, 1968) was a Lithuanian zoologist who moved to the United States where he completed his education.
[1] Šivickis was born in a village in Šiluva parish in the Raseiniai region of central Lithuania.
Hearing that he was on a list of people that the Tsarist government planned to arrest, he moved to the United States in 1906.
By 1920 he had graduated from the Natural Sciences Department of the University of Chicago and two years later received his doctorate, his thesis being on the subject of the regeneration of flatworms.
[2] He and the students he inspired published many scientific papers on soil, aquatic and parasitic invertebrates and other insects.