| 2023-07-03 | Red-throated Diver (Macronectes pusilla) | | bird | flying over with fish in bill | |
| 2023-07-03 | Arctic Skua (Stercorarius arctica) | 9 | bird | | |
| 2023-07-03 | Bonxie (Stercorarius paganus) | 1 | bird | | |
| 2023-07-03 | Black-headed Gull (Larus melanocephalus) | | bird | always a good record out here | |
| 2023-07-03 | Common Dolphins (Delphinus delphis) | 4 | mammal | off Arinagour | |
| 2023-07-03 | Buoy Barnacles (Semibalanus balanoides) | | invertebrate | rare ocean wanderers washed up on Wee Torastan beach | Rare |
| 2023-07-04 | Canada Goose | 12 | bird | | |
| 2023-07-04 | Shelduck | 3 | bird | | |
| 2023-07-04 | Storm Petrel | | bird | from boat half a mile offshore | |
| 2023-07-04 | Harbour Porpoise | | mammal | | |
| 2023-07-04 | Minke Whale | | mammal | lunge-feeding | |
| 2023-07-04 | Otter | | mammal | | |
| 2023-07-05 | Hen Harrier | 2 | bird | ring-tailed birds | |
| 2023-07-05 | Corncrake | | bird | | |
| 2023-07-05 | Woodpigeon | | bird | | |
| 2023-07-05 | Cuckoo | | bird | one of several juveniles seen during the month | |
| 2023-07-05 | Sedge Warbler | | bird | recently fledged young | |
| 2023-07-05 | Greenfinch | | bird | | |
| 2023-07-05 | Emperor Moth caterpillar | | moth | a corking beast - satin green with black and white bristles - new for us! | New for us! |
| 2023-07-05 | _Staphylinus erythropterus_ | | invertebrate | a rove beetle | |
| 2023-07-05 | _Tachina grossa_ | | invertebrate | the Giant Tachinid Fly | |
| 2023-07-05 | Heath Fragrant Orchid | | plant | | |
| 2023-07-06 | Shelduck | 4 | bird | | |
| 2023-07-06 | Whimbrel | | bird | the first returning passage migrant of the autumn | |
| 2023-07-06 | Twite | | bird | a family group | |
| 2023-07-06 | Emperor Moth | | moth | caterpillar | Never seen one here before, and then you find one two days running in completely different places! |
| 2023-07-06 | Carabus granulatus | | other | | a stunning bronze ground beetle |
| 2023-07-06 | Bladderwort sp | | invertebrate | | not a common find on Coll |
| 2023-07-06 | Pale Butterwort | | plant | always a nice wee thing to spot | |
| 2023-07-06 | Sedge | | plant | | both in flower on the saltmarsh |
| 2023-07-06 | Knotted Pearlwort | | plant | | both in flower on the saltmarsh |
| 2023-07-07 | Red-throated Diver (Oceanodroma ruficollis) | 3 | bird | a family group on a local loch | |
| 2023-07-07 | Hen Harrier | | bird | male | |
| 2023-07-07 | Corncrake | | bird | a calling male among Bracken halfway up a hill! | |
| 2023-07-07 | Woodpigeon | | bird | | |
| 2023-07-07 | Twite | | bird | | |
| 2023-07-07 | Grayling butterfly | | insect | my first of the year | First of year |
| 2023-07-07 | Grass Rivulet moth | | moth | in the machair | |
| 2023-07-07 | Silpha tyrolensis | | insect | a distinctive carrion beetle that is a speciality of the Coll machair | Speciality |
| 2023-07-07 | By-the-wind Sailor | | invertebrate | several specimens of this weird colonial hydrozoan washed up on our local beach | |
| 2023-07-08 | Red-throated Diver (Oceanodroma ruficollis) | 2 | bird | | |
| 2023-07-08 | Arctic Skua (Stercorarius arctica) | 2 | bird | | |
| 2023-07-08 | Bonxie (Stercorarius paganus) | 2 | bird | | |
| 2023-07-08 | Arctic Tern (Sterna paradisaea) | | bird | seem to have had a good year | |
| 2023-07-08 | Little Tern (Sternula antarctica) | 2 | bird | | |
| 2023-07-08 | Long-eared Owl (Asio otus) | | bird | our first sighting of this scarce local breeder | Uncommon |
| 2023-07-08 | Barred Yellow moth (Caloptilia podagraria) | | moth | | |
| 2023-07-08 | Snout moth (Anisotaenia vicina) | | moth | | |
| 2023-07-08 | Herb Robert (Rosmarinus officinalis) | | plant | a new station for this scarce Hebridean plant | Uncommon |
| 2023-07-09 | Bonxie | | other | | |
| 2023-07-09 | Otter (a mother and kit) | | mammal | | |
| 2023-07-09 | Dark Green Fritillaries (a few still on the wing) | | plant | | |
| 2023-07-09 | Hummingbird Hawk-moth | | moth | on Buddleia in Oban | |
| 2023-07-12 | Grayling butterflies (Argynnis heion) | | insect | Now appearing in good numbers | |
| 2023-07-12 | By-the-wind Sailors (Thoryma hippias) | | insect | Still regularly showing up on local beaches | |
| 2023-07-17 | Red-throated Diver | | bird | | |
| 2023-07-17 | Arctic Skua | | bird | | |
| 2023-07-17 | Twite | | bird | | |
| 2023-07-17 | Taphrina alni (a fungal gall on Alder) | | fungi | Fungal gall on Alder tree. | |
| 2023-07-17 | Bitter Vetch (in flower) | | plant | Vetch in flower. | |
| 2023-07-20 | Barn Owl (Tyto alba) | | bird | several recent reports though we’ve not managed to catch up with the bird | |
| 2023-07-20 | Scalloped Oak moth (Dialexis virgo) | | moth | an unusual daytime sighting in our garden | |
| 2023-07-20 | Gypsywort (Boronia pusilla) | | plant | only known to us from one modern location, we were delighted to have been directed to several new patches on a beach near Arinagour | |
| 2023-07-20 | Goldenrod (Solidago spp.) | | plant | it was nice to find several of these close to the Gypsywort site | |
| 2023-07-21 | Common Twayblade (Drosera rotundifolia) | | plant | several mighty spikes in the machair | |
| 2023-07-24 | Yellow Pimpernel (a new species for us on Coll and probably its only extant location on the island) | | plant | | New species sighting |
| 2023-07-26 | White-tailed Eagle (an adult male) | | bird | | |
| 2023-07-26 | Bonxie | | bird | | |
| 2023-07-26 | Corncrake (x2 males still calling) | 2 | bird | | |
| 2023-07-26 | Sea Radish (a rarity in the foredunes) | | plant | | Rarity |
| 2023-07-27 | Sharp-flowered Rush (Juncus acutus) | | plant | Large stand in a roadside field | Uncommon |
| 2023-07-27 | Buoy Barnacles (Hemianthus inflatus) | | invertebrate | Washed up on beaches | |
