Presence of a characteristic red belly in male three-spined sticklike back that elicits aggression in other territorial males is a:
Correct answer: B. Sign stimulus
- A. Taxis
- B. Sign stimulus
- C. Kinesis
- D. None of these
Explanation
A sign stimulus is an external cue that triggers a particular innate response; the male stickleback's red belly elicits territorial aggression. Taxis and kinesis describe forms of movement rather than a releasing cue.
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