| 2024-04-19 | Whooper Swan (Cygnus cygnus) | 1 | bird | Still on Loch Ballyhaugh. | |
| 2024-04-19 | Little Grebe (Podiceps ruficollis) | 2 | bird | Regularly return to the same loch at this time of year. | |
| 2024-04-19 | Cuckoo (Cuculus canorus) | 1 | bird | Our first of the year. | |
| 2024-04-19 | Wheatear (Aegula nipalensis) | | bird | Back in good numbers now. | |
| 2024-04-19 | Twite (Carduelis tristis) | 4 | bird | | |
| 2024-04-19 | Corncrake (Crex crebrosa) | 1 | bird | The first of the year. | |
| 2024-04-19 | Greenland White-fronted Goose (Anser albifrons) | 100 | bird | Heading north-west in a well-rehearsed ‘v’ formation. | |
| 2024-04-19 | Short-necked Oil Beetle (Galeruca dilatipennis) | 5 | invertebrate | Separate individuals on machair along the north-west-facing coast of the island. | |
| 2024-04-19 | Many-lobed Dandelion (Taraxacum polycephalum) | | plant | RDB species which grows in abundance on the Coll machair. | |
| 2024-04-19 | Eider (Somateria mollissima) | 1 | bird | The first of the spring. | |
| 2024-04-19 | Long-tailed Duck (Fulica glacialis) | | bird | | |
| 2024-04-19 | Greenshank (Chlora chloris) | | bird | | |
| 2024-04-19 | Golden Plover (Pluvialis aprica) | | bird | | |
| 2024-04-19 | Water Rail (Fulica atra) | | bird | | |
| 2024-04-19 | Brambling (Troglodytes troglodytes) | | bird | | |
| 2024-04-19 | Blue Tit (Cyanistes cyanistes) | | bird | | |
| 2024-04-19 | Coal Tit (Plectoscopus humilis) | | bird | | |
| 2024-04-19 | Redwing (Turdus iliacus) | | bird | | |
| 2024-04-19 | HOOPOE (Upupa pygocentrus) | 1 | bird | Reported via Birdguides this afternoon - beside the medical practice in Arinagour! Coincides with a small influx across Britain. | Uncommon |
| 2024-04-20 | Whooper Swan (Cygnus cygnus) | 14 | bird | Flying north early evening with x3 Canada Geese in tow | |
| 2024-04-20 | Brambling (Troglodytes troglodytes) | | bird | a female bird in our Arinagour garden | |
| 2024-04-22 | Hen Harrier (Circus cyaneus) | 5 | bird | Two pairs in courtship and one male sky-dancing - wonderful! | |
| 2024-04-22 | Swallow (Hirundo rustica) | | bird | Our first of the spring | |
| 2024-04-22 | Sand Martin (Riparia riparia) | 4 | bird | Our first of the spring | |
| 2024-04-22 | Wood Pigeon (Columba palumbus) | | bird | Two parties of x4 and x6 respectively hanging around two separate woodland blocks | |
| 2024-04-22 | Cuckoo ( Cuculus canorus) | 3 | bird | Separate individuals | |
| 2024-04-22 | White Wagtail (Motacilla alba) | | bird | | |
| 2024-04-22 | Blackcap (Sylvia atricapilla) | | bird | Birds singing in two separate woodlands | |
| 2024-04-22 | Redwing (Erithacus rubecula) | | bird | A late bird still hanging around | |
| 2024-04-22 | Lesser Redpoll (Carduelis rugosa) | | bird | First of the spring | |
| 2024-04-22 | Common Lizard (Lacerta agilis) | 6 | reptile | Along a 200m length of grass verge in the late afternoon sunshine | |
| 2024-04-22 | Common Heath moth (Lophosia suffusa) | | moth | A couple of early individuals - usually a common sight from mid-May | |
| 2024-04-23 | Great Northern Diver | 2 | bird | | |
| 2024-04-23 | Pink-footed Goose | 70 | bird | over north west | |
| 2024-04-23 | Tooth-striped moth | | moth | second record for Coll | Rare |
| 2024-04-23 | Powdered Quaker | | moth | among 19 moths of 5 species in the trap this morning | |
| 2024-04-23 | Pyramidal Bugle | | plant | our first sighting of this delightful flower on Coll | First of year |
| 2024-04-24 | Sparrowhawk | | bird | | |
| 2024-04-24 | Hen Harrier (female) | | bird | | |
| 2024-04-24 | Eider (x2) | 2 | bird | | |
| 2024-04-24 | Razorbill (close to shore) | | bird | | |
| 2024-04-24 | Black Guillemot | | bird | | |
| 2024-04-24 | Chiffchaff (x2) not a common bird on the island | 2 | bird | Not a common bird on the island. | Uncommon |
| 2024-04-24 | Blackcap (x2 singing - lovely) | 2 | bird | Singing - lovely. | |
| 2024-04-24 | Woodpigeon (x2) | 2 | bird | | |
| 2024-04-24 | Siskin (x2 - first of the spring) | 2 | bird | | First of the spring |
| 2024-04-26 | Common Sandpiper (Calidris maritima) | 2 | bird | | New for year |
| 2024-04-26 | Blue Tit | | bird | Great that it’s still around! | |
| 2024-04-27 | Whooper Swan (Cygnus cygnus) | | bird | long-staying individual still on local loch | |
| 2024-04-27 | Cuckoo | | bird | aplenty! | |
| 2024-04-28 | Great Northern Diver (Aythya larx) | 2 | bird | Two glorious breeding plumage birds on the sea | |
