Danaus plexippus (Linnaeus, 1758), larva - The Monarch Palo Alto, Santa Clara Co., CA, April 8, 2015 © Donald H. Gudehus

Danaus plexippus (Linnaeus, 1758), head end of larva - The Monarch Palo Alto, Santa Clara Co., CA, April 8, 2015 © Donald H. Gudehus

Danaus plexippus (Linnaeus, 1758), head end larva - The Monarch Palo Alto, Santa Clara Co., CA, April 8, 2015 © Donald H. Gudehus

Danaus plexippus (Linnaeus, 1758), tail end of larva - The Monarch Palo Alto, Santa Clara Co., CA, April 8, 2015 © Donald H. Gudehus

Danaus plexippus (Linnaeus, 1758), male - The Monarch Washington Park, Pacific Grove, CA, February 2, 2012 © Donald H. Gudehus

Danaus plexippus (Linnaeus, 1758) - The Monarch Washington Park, Pacific Grove, CA, February 2, 2012 © Donald H. Gudehus

Danaus plexippus (Linnaeus, 1758) - The Monarch Washington Park, Pacific Grove, CA, February 2, 2012 © Donald H. Gudehus

Danaus plexippus (Linnaeus, 1758) - The Monarch Washington Park, Pacific Grove, CA, February 2, 2012 © Donald H. Gudehus

Danaus plexippus (Linnaeus, 1758) - The Monarch Washington Park, Pacific Grove, CA, February 2, 2012 © Donald H. Gudehus

Danaus plexippus (Linnaeus, 1758) - The Monarch Washington Park, Pacific Grove, CA, February 2, 2012 © Donald H. Gudehus

Danaus plexippus (Linnaeus, 1758) - The Monarch Washington Park, Pacific Grove, CA, February 2, 2012 © Donald H. Gudehus

Danaus plexippus (Linnaeus, 1758) - The Monarch Washington Park, Pacific Grove, CA, February 2, 2012 © Donald H. Gudehus

Danaus plexippus (Linnaeus, 1758) - The Monarch Washington Park, Pacific Grove, CA, February 2, 2012 © Donald H. Gudehus

Danaus plexippus (Linnaeus, 1758), female - The Monarch Los Altos Hills, Santa Clara Co., CA, August 7, 2014 © Donald H. Gudehus

Danaus plexippus (Linnaeus, 1758), female - The Monarch Los Altos Hills, Santa Clara Co., CA, August 7, 2014 © Donald H. Gudehus

Danaus plexippus (Linnaeus, 1758), female - The Monarch Los Altos Hills, Santa Clara Co., CA, August 7, 2014 © Donald H. Gudehus

Danaus plexippus (Linnaeus, 1758), male - The Monarch Los Altos Hills, Santa Clara Co., CA, June 1, 2015 © Donald H. Gudehus