Considering that mayflies are very sensitive to pollution, I was extremely surprised to find one on my window, in the middle of Oporto, one of the largest cities in Portugal.
AKA- Pale morning dun (male)
March Brown spinner
AKA- March brown
AKA- Coffin Fly
Mayflies or shadflies are insects belonging to the order Ephemeroptera (from the Greek εφημερος, ephemeros = "short-lived" (literally "lasting a day" "daily" or "day-long"), πτερον, pteron = "wing", referring to the brief lifespan of adults). They have been placed into an ancient group of insects termed the Palaeoptera, which also contains dragonflies and damselflies. They are aquatic insects whose immature stage (called "naiad" or, colloquially, "nymph") usually lasts one year in fresh water. The adults are...