Monarch butterfliesUpdated 8:34 AM ET, Tue February 10, 2015 Chat with us in Facebook Messenger. Find out what's happening in the world as it unfolds. Photos: Monarch butterfliesA monarch butterfly lands on a hibiscus flower in Virginia. Hide Caption 1 of 6 Photos: Monarch butterfliesThe Oyamel forest at El Rosario sanctuary in Angangueo, state of Michoacan, Mexico. Hide Caption 2 of 6 Photos: Monarch butterfliesMillions of monarch butterflies arrive each year to breed in the Oyamel forest in Angangueo, after traveling more than 4,500 kilometers from the United States and Canada. Hide Caption 3 of 6 Photos: Monarch butterfliesMonarch butterfly larva.Hide Caption 4 of 6 Photos: Monarch butterfliesMonarch Butterfly Biosphere Reserve in El Rosario in Mexico. Hide Caption 5 of 6 Photos: Monarch butterfliesThe decline of monarch butterflies is a cause of concern among conservationists.Hide Caption 6 of 6The decline of monarch butterflies is a cause of concern among conservationists.More from OpinionWhy UK would miss ScotlandEdie Windsor in her own words: My late wife is thanking you, tooOpinion: 'The Muslims are coming!' Why Islamophobia is so dangerous¿Por qué son tan caros los cuidados médicos en EE.UU.?Brieger: oposición venezolana va camino de legitimar sus "instituciones paralelas"