The teeth and claws could be for symbolic threat displays during mating season. (realclimate.org)
Could have taken off Joe Gomez and replaced him with the superior delivery of Trent Alexander - Arnold given the lack of threat displayed by Swansea. (anfieldindex.com)
Sarcastic fringeheads have a truly spectacular threat display: they open their mouths until they're gaping wide, displaying two rows of teeth and fluorescent cheeks (newscientist.com)