The Conibear 330™ failed to render irreversibly unconscious in ≤3 min one lynx (Felis lynx) struck in the shoulders and two of eight lynx struck in the neck region, in simulated natural environments. A Conibear 330™ with two clamping bars rendered unconscious in ≤3 min eight lynx struck in the neck and one struck in the shoulders. The mean (±SE) times to loss of consciousness and heartbeat were 67.2 (±4.0) sec and 196.0 (±10.4) sec, respectively. This modified Conibear 330™ can be expected to render ≥70% of captured lynx irreversibly unconscious in ≤3 min (P < 0.05).