Red Admiral

Fascinating facts about the Red Admiral

• When a red admiral pupates in a hot summer, it can emerge in just under a week, but the same species may linger for weeks in cooler weather. At higher temperatures, around 32 degrees Celsius (90 °F), the pupal period of the red admiral is 6 days. At 11 to 18 degrees Celsius (51 to 64 °F) this period increases to 18 to 50 days. At even lower temperatures around 7 degrees Celsius (45 °F), the pupal period lasts between 47 and 82 days. The pupae are bright scarlet at high temperatures and black with a smaller scarlet area at low temperatures, showing how temperature directly sculpts both development speed and adult coloration, which in turn influences seasonal camouflage and mate attraction.
• Male red admirals defend oval territories, patrolling their edges dozens of times each hour. Territories tend to be oval, 8-24 feet (2.4-7.3 m) long and 13-42 feet (4.0-12.8 m) wide. Males patrol their territory by flying around the perimeter between 7 and 30 times per hour. On average, territory holders interact with intruders 10 to 15 times per hour. This relentless aerial vigilance boosts a male's chance to court females, illustrating how spatial control drives reproductive success.
• Red admirals hitch rides on fast-moving air currents high above the ground, cutting the energy cost of their seasonal trek. During migration, the red admiral flies at high altitudes where high-speed winds carry the butterfly, reducing energy expenditure. By exploiting these wind corridors, the butterflies recolonize temperate zones each spring.
• Warming winters have nudged the red admiral's calendar forward by weeks, reshaping its life-cycle timing. Spring temperatures in central England between 1976 and 1998 increased by 1.5 degrees Celsius and summer temperatures increased by 1 degree Celsius. Following this 22-year period of warming, the red admiral appeared six weeks earlier in the year. Of 35 species of butterflies studied in central England, the change in the duration of flight period was most significant in the red admiral, exhibiting a 39.8 day increase. These shifts could expand its range northward.
• The red admiral sees the world in blues, greens and yellows but cannot tell orange from red. Red admirals have color vision in the 440-590 nm range of the visible spectrum which includes indigo, blue, green, and yellow. A consequence of this lack of pigment is that the red admiral cannot differentiate between colors in the 590-640 nm range, which includes orange and red.

Sources

Every fact above was checked against these pages, and kept only where one of them states it.

• Wikipedia

At a glance

About the Red Admiral

As the Red Admiral dances through the warm, sun-drenched air, its striking black wings, adorned with vibrant red and white accents, beat in a hypnotic rhythm, drawing the eye like a magnet to its mesmerizing spectacle. With each delicate flutter, it navigates the intricate tapestry of its surroundings, sipping nectar from flowers and basking in the radiance of its habitat, a true embodiment of elegance and resilience. In its effortless gliding, the Red Admiral embodies the very essence of freedom, its beauty and agility a testament to the wonders of the natural world.

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