| 2023-08-01 | Catoptria margaritella (our first record of this possibly quite common day-flying moorland grass-moth!) | | moth | | First of year |
| 2023-08-06 | Snow Goose (Cygnus cyanus) | 4 | bird | Juvenile Snow Goose reported with x4 adults - it seems our feral birds may have bred for the first time in several years | First of year |
| 2023-08-06 | Whimbrel (Numenius americanus) | | bird | A return passage soloist | |
| 2023-08-06 | Kittiwake (Rissa tridactyla) | 500 | bird | on shoreline rocks | |
| 2023-08-06 | Little Tern (Sternula antarctica) | | bird | flying over and calling in company with Arctic and Common Terns | |
| 2023-08-06 | Cuckoo (Cuckoo cuckoo) | | bird | Juvenile | |
| 2023-08-06 | Woodpigeon (Columba palumbus) | 3 | bird | x3 together - unheard of Hebridean delights! | Uncommon |
| 2023-08-07 | Long-tailed Tit (Parus montanus) | | bird | Not a common bird out here | |
| 2023-08-07 | Dark Green Fritillary (Aglais urticae) | | insect | Still a few on the machair | |
| 2023-08-07 | Large Heath | | plant | | |
| 2023-08-07 | _Catoptria margaritella_ | | moth | Having seen our first a week ago we’re now seeing them on every moorland walk! | First of year |
| 2023-08-07 | Heath Bumblebee | | insect | | |
| 2023-08-07 | Moss Carder Bee | | insect | | |
| 2023-08-09 | _Abia nitens | | insect | Sawfly larva basking on a Devil’s-bit Scabious Flower - a first for Coll! | First of year |
| 2023-08-10 | Hen Harrier (ring-tail) | | bird | | |
| 2023-08-10 | _Volucella bombylans_ (a bumblebee mimic hoverfly) | | insect | | |
| 2023-08-15 | Red-throated Diver (a barking flyover still feeding young at a moorland lochan) | | bird | | |
| 2023-08-15 | Great Skua | | bird | | |
| 2023-08-15 | Wheatear | | bird | a few still around | |
| 2023-08-15 | White Wagtails | | bird | return migrants | |
| 2023-08-15 | Sedge Warbler | | bird | feeding young in our garden | |
| 2023-08-15 | Twite | 4 | bird | | |
| 2023-08-15 | Grayling butterflies | 2 | invertebrate | on the rocky shoreline near our cottage | |
| 2023-08-15 | Ling Heather, Bell Heather and Cross-leaved Heath (white-flowered forms of all three) | | plant | | |
| 2023-08-16 | Arctic Skua (Scolopha arctica) | 3 | bird | Over moorland | |
| 2023-08-16 | Northern Eggar (Calpodes melampus) | | insect | A big fat caterpillar! | |
| 2023-08-16 | Chevron moth (Data varians) | | moth | Grayling, Peacock and Red Admiral | Good day for lepidoptera! |
| 2023-08-16 | Pale Butterworth (Plantago lanceolata) | | plant | A tiny plant in flower | |
