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Vdot_O2 of eggs of the turtleEmydura macquarii, the crocodilianAlligator mississipiensis, and the tuataraSphenodon punctatus, were measured throughout incubation.E. macquarii andA. mississipiensis, species in which hatching synchrony may be important, show a decline inVdot_O2 prior to hatching (‘peaked’ pattern). This is similar to the pattern shown by ratite birds, where the decline period may be variable and facilitates hatching synchrony. The same interpretation is used here for reptiles. Hatching synchrony seems unimportant inS. puntatus, no decline inVdot_O2 is observed, and the pattern ofVdot_O2 is similar to that shown by most precocial birds. Developmental asynchrony in reptilian nests,e.g., E. macquarii, probably results from temperature differences within the nest. Turtles with nests that are unlikely to experience developmental asynchrony, show truncation of the ‘peaked’ pattern, similar to the usual …