| 2024-07-02 | Hen Harrier (a chunky female) | | bird | Hunting over Corncrake fields | |
| 2024-07-02 | Corncrake | 3 | bird | Separate individuals seen in flight | |
| 2024-07-02 | Snipe | | bird | Sawing and flying over breeding grounds | |
| 2024-07-02 | Great Skua | 2 | bird | | |
| 2024-07-02 | Arctic Skua | 2 | bird | | |
| 2024-07-02 | Woodpigeon | 1 | bird | Over fields at Acha | |
| 2024-07-02 | Grass Rivulet | | insect | Day-flying moth on the machair | |
| 2024-07-02 | _Tenthredo_ sp. | | insect | Handsome sawfly sunning itself on an Oxeye Daisy flower | |
| 2024-07-02 | Common Twayblades | | plant | Dozens of flowering stems in the machair - our only regular site for this striking orchid | |
| 2024-07-02 | Frog Orchid | | plant | Good number now flowering in the machair | |
| 2024-07-02 | Northern Marsh Orchid | | plant | A few in the machair - including hybrids with Early Marsh | |
| 2024-07-05 | Snow Goose | 5 | bird | Regular flock of five feral birds | |
| 2024-07-05 | Black-throated Diver | | bird | Smart juvenile bird in Baigh Feall - not a species we see here very often | |
| 2024-07-05 | Hen Harrier | | bird | Female hunting - it’s good to see plenty of females out and about at the moment | |
| 2024-07-05 | Sparrowhawk | | bird | | |
| 2024-07-05 | Arctic Skua | 5 | bird | Five separate individuals | |
| 2024-07-05 | Great Skua | | bird | Still in short supply around Coll this summer | |
| 2024-07-05 | Fulmar | | bird | Several nesting pairs | |
| 2024-07-05 | Belted Beauty moth | | moth | Cracking find of a well-developed caterpillar of this machair speciality | |
| 2024-07-05 | Black Snail Beetle | | invertebrate | _Phosphuga atrata_ | |
| 2024-07-05 | Brown Chafer | | invertebrate | _Serica brunnea_ | |
| 2024-07-05 | Northern Colletes | 2 | invertebrate | Two colonies of this rare solitary mining bee found in the machair | |
| 2024-07-05 | Parsley-piert | | plant | Not an exciting plant - a common weed on the main land - but a first for Coll! | |
| 2024-07-06 | Shelduck (a pair) | 6 | bird | with 6 ducklings on the wild sea | |
| 2024-07-06 | Eider | | bird | a regular female snoozing on rocks in Loch Eatharna | |
| 2024-07-06 | Twite | | bird | a family group | |
| 2024-07-06 | Orchidaceae | 12 | plant | 12 different species of orchid found across the island in recent weeks | |
| 2024-07-07 | White-tailed Eagle (Herring Gull) | | bird | Observed an adult eagle low overhead, attracted by a screaming Herring Gull. | Uncommon |
| 2024-07-08 | Sparrowhawk | | bird | | |
| 2024-07-08 | Corncrake (a few calling males still around) | | bird | | |
| 2024-07-08 | Sericomyia silentis | | insect | a northern and western species not previously recorded in Coll | |
| 2024-07-08 | Common Valerian | 3 | plant | only 3 locations for this lovely wetland species in Coll - rediscovered today at its original station | |
| 2024-07-08 | Northern Marsh Orchid | | plant | | |
| 2024-07-08 | Frog Orchid | | plant | | |
| 2024-07-08 | Common Twayblade | 100 | plant | a bank of maybe a hundred - the only regular location for this orchid in Coll | |
| 2024-07-08 | Northern Colletes | 2 | insect | two more colonies of this rare solitary mining bee found in the machair | rare |
| 2024-07-14 | Greenshank (an early returning migrant) | | bird | | Early returning migrant |
| 2024-07-14 | Emperor moth caterpillar | | insect | | |
| 2024-07-14 | Prickly Saltwort | | plant | hundreds of plants at its only known station on Coll | |
| 2024-07-14 | Sea Beet | | plant | | Coll rarity |
| 2024-07-14 | Goldenrod | | plant | | |
| 2024-07-14 | Elytrigia x laxa (it’s a bit obscure but it is a new grass for Coll - the hybrid of Common Couch and Sand Couch. Not previously recorded on the island.) | | plant | New grass for Coll - hybrid of Common Couch and Sand Couch | First record on the island |
| 2024-07-14 | Teasel | | plant | Another first for Coll - a scarce plant on the west coast | First record on the island |
| 2024-07-14 | Heath Spotted and Lesser Butterfly Orchids | | plant | still in flower | |
| 2024-07-14 | Poplar Hawkmoth | | insect | | |
| 2024-07-14 | Burnished Brass | | moth | | |
| 2024-07-14 | Heart and Dart | | moth | | |
| 2024-07-14 | True Lovers Knot | | moth | | |
| 2024-07-14 | Bright-line Brown-eye | | moth | | |
| 2024-07-14 | Spectacle | | moth | | |
| 2024-07-14 | Rustic | | moth | | |
| 2024-07-14 | Dark Arches | | moth | | |
| 2024-07-14 | Large Yellow Underwing | | moth | | |
| 2024-07-14 | Gold Spot | | moth | | |
| 2024-07-14 | Common Rustic agg | | moth | | |
| 2024-07-14 | Dotted Clay | | moth | | |
| 2024-07-14 | Small Square-spot | | moth | | |
| 2024-07-14 | _Eana penziana_ | | fungi | | |
| 2024-07-15 | Red-throated Diver | | bird | | |
| 2024-07-15 | Hen Harrier (female) | | bird | | |
| 2024-07-15 | Sparrowhawk (female) | | bird | | |
| 2024-07-15 | Arctic Terns and Common Terns | | bird | Both appear to be having a good year breeding on rocky skerries offshore | |
| 2024-07-15 | Red Admiral | | insect | Our first for the year of this long-range migrant species | Uncommon |
| 2024-07-16 | Hen Harrier (male and female) | | bird | | |
| 2024-07-16 | Grayling butterfly | | insect | Our first of the year | |
| 2024-07-16 | Dark Green Fritillary | | insect | Still around in good numbers | |
| 2024-07-16 | Common Hawker dragonfly | | insect | Our first of the year | |
| 2024-07-16 | Scots Pine | | plant | Young trees found during a long walk in the eastern moors | |
| 2024-07-16 | Downy Birch | | plant | Young trees found during a long walk in the eastern moors | |
| 2024-07-16 | Grey Willow | | plant | Young trees found during a long walk in the eastern moors | |
| 2024-07-16 | Bog Hair-grass | | plant | Nationally scarce species; Coll stronghold, never previously observed. | Target species for today's walk. |
| 2024-07-16 | Pipewort | | plant | A more dependable Coll speciality. | |
| 2024-07-17 | Greater Tussock-sedge (Cyperus fusiformis) | | plant | Two more Coll rarities | |
| 2024-07-17 | Lesser Tussock-sedge (Cyperus difformis) | | plant | Two more Coll rarities | |
| 2024-07-18 | Whimbrel (an early return migrant) | | bird | Observed with Curlews. | Early return migrant |
| 2024-07-23 | Canada Goose | | bird | occasional family groups being seen across the island now - they’ll be leaving soon | |
| 2024-07-23 | Field Gentian | | plant | a delightful late summer flower that’s having a particularly good year here on Coll | |
| 2024-07-23 | Frog Orchid and Twayblade | | amphibian | in a new location | |
| 2024-07-23 | Lesser Hawkbit | | plant | an uncommon plant in Scotland which we find only occasionally in the machair. Here it was flowering abundantly | Uncommon |
| 2024-07-23 | Allseed and Chaffweed | | plant | a pair of nationally scarce species which are frequently seen together here | |
| 2024-07-30 | Northern Colletes (a day mapping nesting assemblages of this national rarity) | | insect | Mapping nesting assemblages with Sally Morris from Buglife. | National rarity |
| 2024-07-30 | Bordered Grey moth | | moth | Only the second record on Coll for this nationally notable species. | Nationally notable, rare record |
| 2024-07-30 | Heather Fly | | insect | A new species for us. | New species |
| 2024-07-30 | Belted Beauty moth | | moth | A well-grown caterpillar of this machair speciality. | Machair speciality |
| 2024-07-30 | Many-lobed Dandelion | | plant | We found some fresh vegetative growth today of this very rare early-season dandelion. | Rare, early season |
| 2024-07-30 | Field Madder | | plant | A local rarity at a new location. | Local rarity, new location |
| 2024-07-30 | Bitter Vetch | | plant | Always nice to find. | |
