Five species of soil-dwelling animals were collected under or some distance from the Navy's Project Sanguine extremely low frequency experimental antenna in September 1974 and in summer 1975, and their oxygen consumption and respiratory quotient (RQ) were tested and compared. The species were: earthworms, Lumbricus terrestris L. and Lumbricus rubellus Hoffmeister; slug, Arion sp.; wood louse, Oniscus asellus L.; and redbacked salamander, Plethodon cinereus cinereus (Green). Controls were collected on the same or next day, 6 to 13 miles from the nearest antenna. Test and control animals were tested simultaneously. In September 1974 there were no significant differences in O2 consumption and RQ, except for a marginal difference (0.05 > P > 0.025) in O2 consumption of L. rubellus; in 1975, there were no significant differences. Comparisons of metabolic rates between exposed and control groups in fall 1974 and between fall and summer (1973 and 1975) populations show no seasonally linked change in sensitivity to the electromagnetic fields. Controls showed an autumnal increase in metabolic rate of wood lice and salamanders. Oxygen consumption of wood lice is significantly (P < 0.05) affected by method of shipment but there is no evidence that exposed and control animals react differently from each other to shipment by air or by car. Short-term (1 week) exposure of earthworms to the electromagnetic fields did not alter metabolic rate; however, confinement in nylon bags and translocation did, thereby limiting meaningful conclusions. No abnormalities in behavior, habitat selection, or external features and pigmentation have been observed in any of the exposed populations during 4 yr of collecting and observation.

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