A Spider

-

 It's not a great time of the year to be looking for invertebrates but some animals leave clues to their existence and spiders leave webs. In the stone work of an old railway bridge (underneath and out of the rain) I came across this spider's web.


I am pretty confident that this has been left by a tube web spider Segestriidae. There was no sign of the actual spider but I will have another look when the weather warms up.
Spiders have two body parts (not three like insects) - they have four pairs of legs (not three like insects) - they have simple eyes (not complex ones like insects)  - they never have wings or antennae (where insects do) - and they emerge from the egg with all their adult parts and don't go through metamorphosis like insects do. So now you know!

Diary Notes
Signs of spring yesterday - the first lambs arrived in the field next door.
There were a lot of common gull and lapwing yesterday. This morning the great spotted woodpeckers were drumming, and there was a flock of about 50 pink footed geese grazing in a wet field near Waitby about a mile from us.
Overnight camera traps revealed a badger, two glimpses of fox, wood mice, magpies and rooks.



Comments

Post a Comment

Popular posts from this blog

The Dunnock

-
Image
 When I was a boy my first bird book described "hedge sparrows" but at some time in the last 50 years this name has all but disappeared and these birds are now called dunnocks (as they are not closely related to House and Tree Sparrows) Its easy to miss a dunnock! They are little brown birds and they tend to feed on the ground and keep to the cover of vegetation if they can. The males are territorial and the birds pair up in the spring. The pair are not strictly monogamous and the female will mate with another male if she gets the chance. DNA testing reveals that a brood often has more than one father. The male dunnocks are alert to this possibility and can sometimes be seen pecking at the cloacal opening of the female in an attempt to get her to expel the sperm of the competitor. The sexes look alike and these birds are common and widespread in Britain. The males get involved in feeding young according to their breeding success so it is common to find two males and one femal...
Read more

White Clawed Crayfish

-
Image
 I went for a walk yesterday that took me along the Scandal Beck (a tributary of the River Eden). On the banks of the river was a stone that had obviously been used as a picnic table by an otter and the remains of his meal were strewn about. A recognisable part of the leftovers is shown below. It's clear that this claw comes from a white clawed crayfish. These animals are not common in the UK as they need the water to be rich in calcium. This requirement is fulfilled in the Eden valley by the limestone substrate. I think that the River Eden is as far North as theses animals get. I know that there are crayfish in this part of the system because for a number of years I have volunteered with the Eden Rivers Trust to survey them. It was not uncommon to find a couple of hundred animals in a 300m stretch of river. The following images give an indication of scale. In recent years the population of the native white clawed crayfish has been threatened by the arrival of the invasive signal (...
Read more

Otters

-
 Well another Covid lockdown! As I am confined to the local area I have been having a closer look at the local wildlife. I treated myself to a trail cam and started to see what I could find. After a couple of experimental sessions to get to know the kit I set the camera along a fence line by an old railway track. On the first night I was astonished to get footage of an otter carrying a rabbit! The site is at least 500m from a watercourse which is a drainage ditch that eventually flows into a tiny tributary of the River Eden I hadn't realised that otters eat anything other than fish but apparently they do. I wonder why the otter was carrying the rabbit rather than eating it where it was found. Perhaps it was feeding young? Apparently ottters have young throughout the year. I have only seen an otter near the house once before and that was a late night encounter in the car headlights.
Read more