Adult male:
By Vlad Butsky from San Jose, CA, USA - Flickr, CC BY 2.0, https://commons.wikimedia.org/w/index.php?curid=1528791
Adult female:
By Vlad Butsky from San Jose, CA, USA - Flickr, CC BY 2.0, https://commons.wikimedia.org/w/index.php?curid=1528793
Mature males are a darker color...