Cross-section of hellbender skin containing secretion-filled glandular cells. This figure is published in colour in the online version.
Mean (± SE) latency to move (a) and number of lines crossed (b) for hellbender larvae exposed to chemical cues from trout paired with either adult hellbender secretion (HB) or blank water during training and exposed to trout cues alone during testing.
Mean (± SE) latency to move for younger and older hellbender larvae exposed to trout stimuli. Larvae were previously conditioned with either trout stimuli paired with hellbender secretion (HB) or trout stimuli paired with blank water. Data for younger larvae are original, whereas data for older larvae are from Crane and Mathis (2011).