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Description
The attraction of this route is that it takes the visitor through several areas of varying habitats. These include mixed woodland, permanent pasture and arable farmland. The reservoir has two small inflow streams and these areas have willows and reed fringe banks. The main body of the reservoir is always worth checking, as is the rocky dam. Thornton Reservoir is a trout fishery, with both bank fishing and boat anglers. The season runs from February to November and this obviously causes some disturbance. The reservoir has also become very popular with walkers, dog walkers, joggers and cyclists. All these activities can impact on the birding experience and likely busy times are best avoided.
A short visit can be productive as most of the reservoir is viewable from the main car park. Common species of water birds can be seen, including geese, duck, and grebes. A longer visit, involving a walk around the reservoir can present a wide range of farm and woodland species. This makes Thornton a suitable site for the novice.
In winter with less disturbance from anglers a small gull roost can develop. All of the five common gull species can be seen and racek černohlavý is annual. Wildfowl numbers can be variable. In recent years flocks of berneška velká and husa velká have taken to grazing the surrounding pasture and resting on the reservoir. berneška bělolící, husa krátkozobá and husice nilská have all been seen associating with these commoner species. Rarer ducks that are worth checking for include hohol severní, polák kaholka, morčák malý and morčák velký. Alder trees are found at both inflows and these regularly have small flocks of čížek lesní and čečetka tmavá. Finch flocks have been increasing in recent years as stubble is often left until the spring. Although mainly pěnkava obecná, strnad obecný and occasional pěnkava jikavec are also seen.
Spring passage can produce some variety. pisík obecný are regular on the dam, and the pasture along the east bank is worth checking for konipas luční, bělořit šedý and kos horský. Two tern rafts were installed by LROS and rybák obecný has bred. Both rybák dlouhoocasý and rybák černý are seen on passage. racek malý and racek tříprstý can occasionally be encountered. In summer the common warblers breed, although rákosník obecný, rákosník proužkovaný and cvrčilka zelená are now less frequent. konipas horský is a regular breeder and family groups can be seen in the spillway. Common raptors such as káně lesní, krahujec obecný and poštolka obecná can give great views, and ostříž lesní, luňák červený and orlovec říční are now more regular.
Unless water levels are low there is little wader passage at Thornton. However, the dam is always worth checking and has yielded tenkozobec opačný, slučka malá, koliha malá and jespák rezavý in recent years. Autumnal storms can deliver surprises, and buřňáček dlouhokřídlý, terej bílý and rybák bělokřídlý have been recorded. Chřástal vodní is often encountered at the Markfield inflow and the single chřástal kropenatý record was in this area.
With past records of bukáček malý, moták lužní, rybák velkozobý and Dytík úhorní, Thornton has produced some good county rarities. More recently polák malý, kvakoš noční, hoholka lední, volavka rusohlavá and kolpík bílý have been added. Grey-headed Wagtail, a Leicestershire first and hýl rudý, a Leicestershire and Rutland first, have also been recorded.
Details
Access
Thornton Reservoir lies to the east of the village of Thornton. The main car park is located at SK470074. A gravel path allows visitors to walk around the reservoir, a distance of 2.7 miles. Click on the P in the map to get directions.