Isle of Anglesey — county
- Group
- Mosses
- Peak month
- May
- Records since 2000
- 210
- Group
- True bugs
- Peak month
- June
- Records since 2000
- 186
- Group
- Birds
- Peak month
- July
- Records since 2000
- 167
- Group
- True flies
- Peak month
- July
- Records since 2000
- 152
- Group
- Caddisflies
- Peak month
- June
- Records since 2000
- 144
- Group
- Butterflies and moths
- Peak month
- June
- Records since 2000
- 101
- Group
- Butterflies and moths
- Peak month
- May
- Records since 2000
- 94
- Group
- True bugs
- Peak month
- July
- Records since 2000
- 76
- Group
- True flies
- Peak month
- April
- Records since 2000
- 75
- Group
- Spiders
- Peak month
- July
- Records since 2000
- 63