| 29/12/05 | Great Crested Grebe | Purley on Thames, Reading | 4 | M J Smith |
| 2 pair on Thames. |
| 27/12/05 | Great Crested Grebe | Lower Farm Trout Lake | 6 | S A Graham |
12:45
| |
| 26/12/05 | Great Crested Grebe | Moatlands GP, Theale GPs | 7 | S A Graham |
16:15
| |
| 26/12/05 | Great Crested Grebe | Main Pit, Theale GPs | 9 | S A Graham |
14:30
| |
| 26/12/05 | Great Crested Grebe | Lower Farm Trout Lake | 9 | S A Graham |
10:30
| |
| 20/12/05 | Great Crested Grebe | Lower Farm Trout Lake | 7 | S A Graham |
10:45
| |
| 18/12/05 | Great Crested Grebe | Lower Farm Trout Lake | 5 | S A Graham |
11:00
| Minimum count. |
| 08/12/05 | Great Crested Grebe | Whiteknights Lake, Reading | 2 | P Gipson |
13:45
| Pair (still in winter plumage) displaying. |
| 04/12/05 | Great Crested Grebe | Main Pit, Theale GPs | 5 | S A Graham |
12:45
| Minimum count. |
| 03/12/05 | Great Crested Grebe | Thatcham GPs | 16 | S A Graham |
14:30
| On the lake opposite the Discovery center. |
| 28/11/05 | Great Crested Grebe | Old Slade GP | 14 | R Dryden |
13:30
| Unusually, no Little Grebe. |
| 20/11/05 | Great Crested Grebe | Lavell's Lake, Dinton Pastures CP | 1 | S A Graham |
12:00
| |
| 05/11/05 | Great Crested Grebe | Lower Farm Trout Lake | 3 | S A Graham |
14:00
| |
| 04/11/05 | Great Crested Grebe | Lower Farm Trout Lake | 3 | S A Graham |
14:00
| |
| 20/10/05 | Great Crested Grebe | Whiteknights Lake, Reading | 1 | P Gipson |
16:25
| First record for months of a species that usually breeds at this site. |
| 24/08/05 | Great Crested Grebe | Purley on Thames, Reading | 8 | M J Smith |
20:30
| 2 pair and 1 pair with 2 grebelets. |
| 23/08/05 | Great Crested Grebe | Lower Farm GP | 2 | S A Graham |
09:00
| 2 ad. No signs of any chicks. |
| 20/08/05 | Great Crested Grebe | Lower Farm GP | 3 | S A Graham |
14:15
| 2 ad & 1 juv. Pair with one newly hatched chick. |
| 03/07/05 | Great Crested Grebe | Woolhampton GPs | 1 | P Jones |
| |
| 29/06/05 | Great Crested Grebe | Lavell's Lake, Dinton Pastures CP | 5 | F J Cottington |
13:40
| Lavell's pair + 3 young. |
| 29/06/05 | Great Crested Grebe | Lower Farm GP | 2 | S A Graham |
08:15
| Displaying, so still the chance of a nesting attempt. |
| 12/06/05 | Great Crested Grebe | Aldermaston Wharf | 2 | P Jones |
| ad & juv. juv. suggests breeding at gravel pits. |
| 10/06/05 | Great Crested Grebe | Maiden Erlegh Lake, Reading | 7 | R Reedman |
09:30
| ad pr, 5 juv. Young birds growing well. |
| 04/06/05 | Great Crested Grebe | Thatcham GPs | 4 | S A Graham |
15:00
| 3 ad & 1 juv. One pair nesting on the main lake, adult and juv on Jubilee lake. |
| 24/05/05 | Great Crested Grebe | Queen Mother Reservoir | 50 | R Dryden |
13:30
| Minimum count - Choppy waves made count tricky. Almost all around the first tower. Key holders only. |
| 15/05/05 | Great Crested Grebe | Horton GPs | 85 | F J Cottington |
15:39
| An unusually high number of non breeding birds gathering on this pit. |
| 08/05/05 | Great Crested Grebe | Hosehill Lake, Theale GPs | 6 | S A Graham |
10:30
| |
| 23/04/05 | Great Crested Grebe | Moatlands GP, Theale GPs | 8 | S A Graham |
14:30
| 7 ad & 1 juv. Six adults amongst the Tufted Duck, but another adult, and a well grown Juv. on the smaller fishing pond to the S. Well marked face pattern, and almost fully grown. |
| 05/04/05 | Great Crested Grebe | Bray GPs | 12 | D N Rimes |
12:30
| |
| 02/04/05 | Great Crested Grebe | Lower Farm GP | 2 | S A Graham |
14:00
| |
| 02/04/05 | Great Crested Grebe | Lower Farm Trout Lake | 2 | S A Graham |
14:00
| |
| 01/04/05 | Great Crested Grebe | Lower Farm Trout Lake | 2 | S A Graham |
09:20
| |
| 28/03/05 | Great Crested Grebe | Purley on Thames, Reading | 10 | M J Smith |
| 5 pair in 1 mile stretch 9of Thames. |
| 28/03/05 | Great Crested Grebe | Dorney Wetlands, Jubilee River | 2 | M Trend |
17:00
| |
| 20/03/05 | Great Crested Grebe | Purley on Thames, Reading | 6 | M J Smith |
| 3 pair. |
| 09/03/05 | Great Crested Grebe | Horton GPs | 30 | R Dryden |
13:30
| |
| 15/02/05 | Great Crested Grebe | Bray GPs | 12 | D N Rimes |
12:30
| |
| 14/02/05 | Great Crested Grebe | Lower Farm GP | 2 | S A Graham |
17:10
| |
| 10/02/05 | Great Crested Grebe | Old Slade GP | 12 | R Dryden |
13:30
| |
| 09/02/05 | Great Crested Grebe | Bray GPs | 15 | D N Rimes |
12:30
| |
| 08/02/05 | Great Crested Grebe | Whiteknights Lake, Reading | 2 | P Gipson |
16:00
| |
| 06/02/05 | Great Crested Grebe | Woolhampton GPs | 17 | S A Graham |
10:15
| |
| 31/01/05 | Great Crested Grebe | Bray GPs | 15 | D N Rimes |
12:30
| |
| 16/01/05 | Great Crested Grebe | Lower Farm Trout Lake | 2 | S A Graham |
09:45
| |
| 10/01/05 | Great Crested Grebe | Old Slade GP | 11 | R Dryden |
13:30
| |
| 02/01/05 | Great Crested Grebe | Thatcham Marsh | 19 | S A Graham |
14:00
| Eleven on the main lake, 6 on Jubilee lake, and a pair on Long lake in full sumer plumage, in display, and nest building! |