30 Days Wild – Day 13 – The Eyes Have It

After the long sunny spell of lockdown we are now in a spell of old fashioned English summer weather, a bit of sunshine then a shower or even a thunderstorm.

silt pond

Approaching shower over the Ivy Silt Pond

When the sun comes out it is strong and very warm, these conditions are actually good for insect photography as the insects need to warm up after each cloudy spell meaning they are basking a lot more than in continuously sunny conditions. The timber of the planters outside the Centre make an idea spot to warm up and are being used by lots of species.

leaf cutter bee

leaf-cutter bee

I know Tracy has already posted some pictures of the green-eyed flower bee, but prepare yourselves for another, as they are very smart little insects.

green-eyed flower bee

green-eyed flower bee (male)

The eyes of many insects are very large and provide a huge field of view using an array of separate element arranged together in a compound eye. This is evidently very effective  enabling them to move at speed, through dense vegetation and often backwards or sideways. In some insects the eyes are patterned or coloured, the green-eyed flower bee is both as are the horseflies.

Tabanid

band-eyed brown horsefly Tabanus bromius (male)

This is a male horsefly and so it won’t bite, like a lot of male flies it has much larger eyes than the female providing very close to all-round vision. The size of the eye facets also varies across the eye surface, sometimes in ways that will identify the species. It seems that the larger facets give better acuity. Male horseflies feed at flowers, so not too difficult to find, the large eyes are for finding and  identifying females and avoiding predators as many are large and tempting prey for birds. Horseflies are also very fly fast and it seems they can process visual information much faster than we can allowing them to navigate between obstacles at high speed. The males of many species also perform dance flights, often in the very early mornings, long before the day has warmed up.

I made a site check walk around the reserve, which told me that the rain has produced a spurt of growth in brambles and next week I will need to get out and cut the path edges again. I also found a “new” pyramidal orchid, that is one somewhere I had not seen before and a very fine example it was.

pyramidal orchid

pyramidal orchid

The marsh thistle is just coming into flower, it comes in two colour forms, this being the pale one and is a plant I always associate with silver-washed fritillary, as they seem particularly fond of nectaring at the flowers.

marsh thistle

marsh thistle

Although I ran the moth trap there was not a great deal caught. In the great days of the Victorian moth collectors they did not have lamps to attract moths in any quantity and so found lots by looking for and then rearing larvae. I found this caterpillar on an oak branch, checking in the excellent and recently published Field Guide to Caterpillars by Barry Henwood and Phil Sterling, I concluded it was almost certainly a maiden’s blush.

maiden's blush

maiden’s blush (I think)

 

1 thought on “30 Days Wild – Day 13 – The Eyes Have It

  1. Some lovely captures there! The Green-eyed flower bees are gorgeous, as many photos as you like but the Horsefly is beautiful too. Useful to know the male doesnt bite but if one landed on me I wouldnt hang around to identify whether it would or it wouldnt….Ive been bitten before 😦

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