30/4/21
- Angle Shades moth
29/4/21
- Great Northern Diver (x7)
- Whimbrel (x2)
- Great Skua
- Arctic Skua
- Linnet (singing in garden)
- Twite (singing in garden)
26/4/21
- Great Northern Diver (x3)
- Tufted Duck (x3 – new arrivals)
- Whimbrel (x14+4+2+1 – spring passage has started)
- Hen Harrier (x2 ring-tails)
- Golden Eagle (still around…)
- Little Terns (x6+8 – first of the year)
- Cuckoo
- Swallows
- Sedge Warbler (first of the year)
- Blackcap (two singing males)
- Danish Scurvy-grass (in flower)
24/4/21
- Golden Eagle (a sub-adult individual) – our first on the island!
- Hen Harrier (several sightings of at least 3 individuals)
- Red-throated Diver
- Cuckoo
- Emperor Moth
- Common Heath moth
- Moss Carder Bee (ssp agricolae) queen
- Marsh Violet (in flower)
- Blinks (in flower)
- Several fragments of iron-age pottery discovered
23/4/21
- Red-throated Diver
22/4/21
- Canada Geese (x7)
- Hen Harrier (two separate ring-tails)
- Golden Plover (x25+2)
- Corncrake
- [Great Skua (x4 reported)]
- Arctic Skua
- Manx Shearwater (several hundred individuals off-shore)
- White Wagtail (x4)
21/4/21
- Little Grebe
- Cuckoo (first of the year)
- Sand Martin (first for the year)
- Twite
- Chrysolina staphylea (a leaf beetle – first for Coll)
20/4/21
- Hen Harrier (male)
- Whimbrel (first of the spring)
- Golden Plover (flocks of 40, 30 and then 40)
- Canada Goose (x5)
- Pheasant (a single female has taken up residence locally)
- Twite (impressive flock of 230 birds)
19/4/21
- Great Northern Diver
- Red-throated Diver
- Golden Plover (x3)
- Snipe
- Manx Shearwater (several hundred moving north)
- Swallow (reported)
- White Wagtail (x3)
- Redwing (a single bird of the Icelandic race)
- Twite (a flock of 130)
- Small-spotted Catshark (egg-case on beach)
- Nursehound (egg-case on beach)
- Blonde Ray (egg-case on beach)
- Dolphin sp (a small pod close-in)
18/4/21
- Greenland White-fronted Goose (x12)
- Teal (x12)
- Hen Harrier (male)
- Kestrel
- Arctic Skua
- Golden Plover (x2)
- Corncrake (first of the year)
- Blonde Ray (egg case on beach)
15/4/21
- Great Northern Diver (x3)
- Shelduck (x1 north)
- Curlew (x1)
- Black Guillemot (x3)
- Greenland Wheatear (first of the spring)
- Willow Warbler (first of the year)
- Scots Lovage (leaves)
- Common Scurvygrass (in flower)
14/4/21
- Great Northern Diver (x2)
- Barnacle Geese (small flocks leaving)
- Manx Shearwater (huge rafts offshore)
- Guillemot
- Razorbill
- Puffin
- Twite (x50)
- (Orca and Minke Whale reported yesterday)
4/4/21
- Great Skua (x2 first of year)
2/4/21
- Greenland White-fronted Geese (x63)
- White-tailed Eagle (x3)
1/4/21
- Peregrine Falcon (female found dead on beach)
- Greenfinch (x5)
- (Golden Eagle reported locally again!!)