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Philomycus carolinianus is a fairly “sleepy and inactive” slug (Pilsbry, 1948) that is usually at rest under tree bark. During moist conditions or at night, slugs may be found crawling on fallen logs and tree trunks (Hubricht 1985).
Unlike many slug species, P. carolinianus do not exhibit aggression toward one another, even in dense conditions (Webb 1950b). Philomycus carolinianus have been observed feeding two or three to a mushroom and clustered together on or within logs while resting (Ingram 1949).