Bekoff A, Lau B
J Exp Zool. 1980 Nov;214(2):173-5. doi: 10.1002/jez.1402140207.
Evidence for short sequences of interlimb coordination was found in 20-day-old rat fetuses. Frame-by-frame analysis of videotape records showed phase relationships indicating a pattern of alternation in sequences involving forelimb-forelimb and hindlimb-hindlimb coordination. Forelimb-hindlimb coordination was not observed.