In a pig's eye they are! Joshi A, Wu WP, Mueller LD. 1998. Density-dependent natural selection in Drosophila: Adaptation to adult crowding. EVOLUTIONARY ECOLOGY 12 (3): 363-376.) This study showed that when these fruit flies are grown in conditions of high humidity the wing phenotype of offspring changes almost immediately to suit the conditions.
You can't tell me that's random chance. That's an environmental pressure that's being applied, and the result is a change in phenotype. It's anything but random.
That's not mutation, thats phenotypic plasticity!!!
And when the humidity went back to 'normal' what happened?