| Number seen/Abundance | Date | Location | Comments | Species |
|---|---|---|---|---|
| 1 | 2005-06-10 | In eastern end of bay of Mynydd beach within buoyed area. |
Seen about 100 metres from shore. Occasionally leaping from water and crashing down. Swam across into Abersoch harbour area, jumping our of water every now and again. | Tursiops truncatus |