An easy way to differentiate fly types is by looking at a few key features: 

1. **Dry Flies** – Designed to float on the water’s surface, these have a bushy, lightweight appearance with hackle fibers or foam to keep them buoyant. 

2. **Nymphs** – Imitating aquatic insects in their immature stage, these flies are often slender, weighted, and meant to sink just below the surface. 

3. **Wet Flies** – Similar to nymphs but typically unweighted, these flies are designed to move naturally in the water column. 

4. **Streamers** – Larger and more lifelike, these imitate baitfish or leeches and are fished with movement to trigger aggressive strikes. 

5. **Terrestrials** – Representing land insects like grasshoppers, ants, or beetles, these are usually larger and float on the surface. 

A quick tip: Dry flies look light and fluffy, while nymphs and wet flies have a sleeker or weighted body. Streamers tend to be long and flashy.