Blue-Winged Olive vs Yellow May Dun
Side-by-side species comparison
| Attribute | Blue-Winged Olive | Yellow May Dun |
|---|---|---|
| Scientific Name | Baetis tricaudatus | Heptagenia sulphurea |
| Order | Ephemeroptera | Ephemeroptera |
| Family | Baetidae | Heptageniidae |
| Size | 5-9 mm | 10-15 mm |
| Habitat | Rivers & Streams | Rivers & Streams |
| Diet | Omnivores | Omnivores |
| Regions | North America | Europe |
| Conservation | Least Concern | Least Concern |
Blue-Winged Olive
A small olive-colored mayfly with distinctive bluish-gray wings, abundant in clean streams across North America. It produces multiple generations per year.
Did You Know?
Blue-winged olives are among the few mayflies that hatch in winter, providing vital food for trout during cold months.
Yellow May Dun
A bright sulfur-yellow mayfly common across European rivers during early summer. Its flat nymphs are adapted to fast-flowing water on stony substrates.
Did You Know?
The striking yellow color of this mayfly makes it one of the most easily recognizable species on European rivers.