  Many microorganisms swim in fluids with complex rheological properties.
Although much is now understood about motion of these swimmers in Newtonian
fluids, the understanding is still developing in non-Newtonian fluids --- this
understanding is crucial for various biomimetic and biomedical applications.
Here we study a common model for microswimmers, the squirmer model, in two
common viscoelastic fluid models, the Giesekus fluid model and fluids of
differential type (grade three), at zero Reynolds number. Through this article
we address a recent commentary that discussed suitable values of parameters in
these model and pointed at higher order viscoelastic effects on the squirming
motion.
