  We present Spitzer mid-infrared images from a survey of three dozen
pre-merger strongly interacting galaxy pairs selected from the Arp Atlas. The
global mid-infrared colors of these galaxies and their tidal tails and bridges
are similar to those of normal spiral galaxies, thus this optically selected
sample of interacting galaxies does not have strongly enhanced normalized star
formation rates in their disks or tidal features. Despite distortion and
disturbance these systems continue to form stars at a normal rate on average.
The morphology of these galaxies is generally smoother in the shorter
wavelength IRAC bands than at 8 $\mu$m, where dozens of clumps of star
formation are detected.
