Herbst pointed out that this might be a case of chemotropism, caused by the oxygen surrounding the egg.
The act of seeking the female as well as that of cohabitation are in many cases combinations of chemotropism and stereotropism.
We have already alluded to certain phenomena of chemotropism in Chapter IV.
It is chemotropism, not solicitude for its offspring, which drives the flesh fly to lay its eggs on decaying meat.
chemotropism che·mot·ro·pism (kĭ-mŏt'rə-pĭz'əm)