The quiet month of August, with the bird song all but over, heralds the start of the bird migration. Stover’s migrants will start to put on weight in the next few weeks in preparation for their long journey south. They will start to eat sugar-rich foods, such as rowan berries, elderberries and blackberries, in preference to insects. Look out for whitethroats on bramble patches, garden warblers eating elderberries and blackcaps pecking at rosehips. The adult swifts are already leaving Britain for their wintering grounds in the South. The young birds remain for an extra couple of weeks and then navigate their way back south unaided. Swallows and house martins will start to group en masse this month.
On the heath, the nightjar eggs from both nests were predated during the beginning of July. The adults should now be rearing their second broods, although the nest sites are still to be found.
Although the woods in the Park will seem very quiet, August is quite a busy time for many woodland birds. Many juveniles have now left their parents’ territory and are travelling further afield. They gather into parties with different species of young birds, learning where the best food sources are and trying to avoid predation. The adults are now undergoing a gradual moult to change their plumage. However, bullfinches can still be feeding young in August as many of the seeds on which they feed are ripe.
Goldfinch, siskin, blackcap and bullfinch were all recorded at Stover during July. Young sparrowhawk and tawny owl are now hunting for themselves and cash in on the abundance of young inexperienced birds, and moulting adults who cannot evade capture so well with some of their flight feathers missing.
The remaining cygnet is doing well. The earlier broods of mallard ducklings are now the same size as their parents. Ducklings were still hatching during the first half of the month. Moulting drakes are still in their ‘eclipse plumage’ which means they are hard to tell apart from the females; they will soon re-grow the vivid green plumage on their heads. Moorhen and coot have had a good breeding season with three broods of coot and moorhen. Moorhen numbers are now increasing as juveniles from outside of Stover move through the Park. Their numbers will peak in the winter. The great-crested grebes have not been recorded during the latter week of July and presumably have left the lake after numerous failed attempts at nest building and egg sitting. The mandarin ducks are still present on the lake. Up to 7 tufted ducks have been present on the lake during the first half of July – a reminder autumn isn’t far away! Kingfishers, herons and cormorants have been sighted throughout last month. Black-headed gulls were recorded nearly every day during last month along with small numbers of herring gulls. The black-headed gull numbers will start to increase for the winter along with the cormorants. 6 common sandpipers were recorded on the lake on 8th July; July is a month where sightings are usual. A single green sandpiper was seen on the 27th. It is a passage migrant usually visiting in the spring and autumn. Only its legs are green with its dark upper body being speckled with white.
Young hedgehogs are emerging now and setting off to lead independent lives. Small mammals such as voles and shrews reach peak numbers after their summer’s breeding. Most weasels give birth between May and August, so there are more around now than at any other time of the year. Weasels are much smaller than stoats and can follow a mouse or a vole into its tunnel. Roe deer were seen around the Park last month. Millions of flying ants will take to the air in August, and crickets and grasshoppers can be heard on warm evenings. Adders bask in the sun on the heathland and will give birth to live young (the eggs hatch immediately) in August. Grass-snakes were recorded on a couple of occasions during July in the marsh and swimming in the lake.
Clouds of butterflies and dragonflies are now on the wing. The first silver-washed fritillary sighting was on 3rd July with the first gatekeeper on the 5th and common blue on the 15th. There have been numerous sightings of white admirals but no marbled whites so far this summer. Since 2010, there have not been any sightings of painted ladies. This butterfly can be a regular migrant to Britain from south-west Europe and North Africa, but only when favourable conditions exist on the continent do their numbers swell to produce a larger influx into Britain. A second purple hairstreak was recorded on 7th July (the first seen on 30th June). Purple Hairstreak butterflies are the commonest of the British hairstreaks but are not often seen as they spend most of their time in the canopy of oak trees. The darker form of the comma butterfly can now be seen which is produced in response to shortening day length and will hibernate over the winter. The second brood of brimstone butterflies should just have emerged from eggs laid earlier this year. The larval food plant is alder buckthorn growing in profusion in the Park’s heathland. Red Admirals migrate from the Mediterranean and as soon as they arrive here the females lay their eggs on the nettles. In August the caterpillars will have turned into adults so there should be a peak of red admirals this month. Keep an eye out for the scarlet tiger moth. This day-time flying moth has bright red under-wings as its name suggests. If it is disturbed by a predatory bird it shows off its bright hind-wings to startle the bird as it escapes. It can also defend itself from lizards by secreting two blobs of poisonous, bright yellow liquid from behind its head. Glow-worms should now be visible along the carriage drive and firebreak at dusk.
August is the peak time for watching many of the more impressive dragonflies, such as hawkers, chasers and darters, which coincides with the emergence of many of the insects on which they feed. Keep an eye out for southern hawkers which are usually abundant in August. The first sighting for this year was recorded on 9th July.
One of August’s spectaculars at Stover is the heather which is in full bloom at the moment. Other plants in flower include purple loosestrife, hemp agrimony, figwort, common centuary, valarian and fleabane which are providing nectar for the last of this season’s insects. In the past the stems and leaves of fleabane were burnt to produce smoke that helped to keep fleas away. Bladderwort can be seen in the lake and ponds. This yellow aquatic carnivorous plant has finely divided leaves which bear small bladders. These act like vacuum cleaners sucking in animals which trigger the mechanism. The southern marsh has provided a fantastic display of flowers during last month.
Nature is always one step ahead – take a look at the trees and you’ll see hazel and beech nuts, elder and hawthorn berries, and sycamore seeds amongst the leaves. They’ll need this month to ripen properly before the autumn when they become more visible as the leaves start to drop.
For the fourteenth year running Stover has been awarded the Green Flag by the Civic Trust. The Country Park also received a Certificate of Excellence for the fourth year running awarded by Tripadvisor. These awards reflect the hard work carried out by all of the individuals and volunteer groups that help manage the Park throughout the year.
A big thank you to all involved.