Haiyong Cai (China) notices the shimmery blue colours of eros blue butterflies basking among the vegetation. While wandering through an alpine meadow, Haiyong spotted a patch of blue among the grass.

We asked our readers to send in their best pictures on the theme of "monochrome ... Theresa Bennett: "To help our garden butterflies, I planted a patio tub with cosmos seeds and was rewarded ...

Cal Academy of Sciences and The Presidio join conservation efforts to bring blue butterflies back to San Francisco coast. Genetic sequencing links Silvery blue butterflies to extinct Xerces blue.