SOME male birds possess a wiggling tongue-like knob on their genitals, probably to titillate their mates.
In typical bird copulation, males and females momentarily press together their cloacas - genital openings - in what biologists call a cloacal kiss. A muscled tongue-like projection called a cloacal tip, spotted for the first time in males of several species of Australian wrens, means this might be more like a French kiss.