Holly Blue Butterfly- This is a good time to learn to identify the small Holly Blue. It flies high among bushes and hardly settles -you tend to see is a fast-moving blue flash (very hard to photograph!). The underwings are paler. Holly Blues are out earlier (out now) than other Blues, and much more likely to be the Blue Butterfly you see in your garden or local park or verge. They are the only Blues we get in our Sheffield garden. The caterpillars feed on tender new Holly or Spindle shoots and buds. A real treat- keep your eyes peeled. Conditions: Cloudy, with some sun. Cold nights predicted. Temperature: Max 11- Min 2C.