Fig. 1. Lunge-feeding in blue whales and fin whales. (A) A series of three foraging dives. Each spike at the bottom represents a lunge. (B) Representation of one vertical lunge at depth. During a vertical lunge, whales move significantly faster during the ascent than during the descent (Croll et al., 2001), and underwater video recordings indicate that whales lunge upside-down (J. Calambokidis, personal communication, Cascadia Research Collective, 218 West Fourth Avenue, Olympia, WA 98501, USA). Thus, the whale is depicted upside-down and lunging upwards, with the dashed line indicating the invagination of the tongue. Modified from Berta and Sumich (1999).