All posts by Joe Lipson

About Joe Lipson

I live right next to Garigal

Have you ever seen a fly catch a spider?

Here’s something you don’t see every day, a large fly like creature walking along carrying a sizeable spider underneath it! Now that’s a prey reversal! A bit like seeing a huge rat hauling a dead cat somewhere.

The fly was black, about 4cm in length with long legs that allowed it to carry the spider underneath it and still walk easily. The one I saw was on a mission to get somewhere, it walked quickly over the pavement for about 4m and then climbed a wall before I lost it. It had wings but didn’t try to fly, maybe the spider was too heavy for it. The spider was slightly longer than the fly and looked bulkier, all the spiders legs were gone and it was being carried inverted with it’s abdomen towards the front of the fly.

I think this is a robber fly, it’s somehow caught a large spider and is hauling it off somwehere

Curious as to if this was normal I did some searching. The closest thing I could find that lives in the area is a robber fly. “Robber flies are large, bristly flies that catch their prey (usually other insects) mid-flight.” Robber flys are known to catch and eat spiders, the fly I saw didn’t have the same enlarged powerful chest as the robber fly photos on the articles. It looks like there is some variation between robber fly species so maybe it’s just a different species that I saw.

It was moving fast and I only had my phone on me so I found it hard to get a clear picture, but you can see the size of the spider compared to a garden hose and a house brick. The spider looked like a huntsman, I’m not sure how the fly would have killed it and removed it’s legs, or maybe it found the spider like that?

Fly hauling a large spider away somewhere
Fly hauling a large spider. Garden hose for scale, shame the subject is blury

Resources and references

The Black Cockies are back

They’re back, and they still have an appetite for destruction! Every year about this time the black cockies visit for a day or two, tear up the Banksia trees in our yard then leave.

Black Cockie tearing up a Banksia
Black Cockie tearing up a Banksia

Sulphur Crested Cockies are here in abundance year round, Black Cockies only visit for a few days per year, sometimes I miss them altogether. Yellow tailed black cockatoos are larger than their sulphur crested cousins, they have a louder and more piercing shriek too. A few days before I saw the black cockies this year I heard a chilling shriek in the valley after dark, for a moment I thought it sounded like a person in distress, but I figured it was more animal like. After I saw the Cockies I now think that’s what it was.

Black Cockie in the Banksia tree
Black Cockie in the Banksia tree

This year the black cockies visited on July 23rd, a few weeks earlier than previous years.

Sydney Peppermint Gum Blown Over

Eucalyptus piperita

“A small graceful tree to 15m high, but sometimes much taller” NOPS p.38

During the big storms a few weeks ago I was lying in bed at around 11pm just about to ready to go to sleep when a loud and prolonged cracking sound started coming from just outside the bedroom. I knew right away that the large Sydney Peppermint gum in the back yard was falling over! I jumped up and tried to get to the window but it was pitch dark and storming, I couldn’t a thing. As the cracking continued I was terrified it was going to fall on the house, luckily it went the other way and ended up taking out a sizeable swath of bush and other trees as it came down. Phew!

The Sydney Peppermint gum is  a small to medium tree of up to 15m but can be much taller in the right conditions. It’s trunk is covered by rough grey bark that detaches from the tree and hangs in strips as it reaches higher up revealing smooth white upper branches. The leaves have a strong peppermint smell especially when crushed. The Sydney Peppermint was the first Australian plant to be used medicinally by Europeans. It’s oil was found by a surgeon on the first fleet to be “more efficacious in removing all cholicky  complaints than of the English Peppermint”

As the name suggests Sydney Peppermint gum is found in the Sydney basin, it ranges from the extreme south NSW coast up to the central north coast. Flowering time is early summer.

It was a shame to loose the tree, it was a large feature of the back yard. The pair of kookaburras who used to sit in it came and sat on the toppled tree no doubt wondering what had happened.

Fallen Sydney Peppermint Gum. Sneaker for scale.
It look out a few other sizeable trees as it fell

Resources and references

 

Climate update

I’ve updated the climate pages with the latest data from the BOM.

If this summer felt long and hot to you then you’re right. The graph shows the average summer high is the hottest it’s been for 5 years. Looking at the 1 year averages the cooling trend that started in 2014 has reversed and we’re warming again. As always the longer term 30 year averages still show a very clear and consistent warming trend. The warming acceleration that started in 2013 is continuing.

Still no update from the BOM on sea level measurements, we’re stuck at the end of 2014 with that.

Rainfall data shows no clear long term trend, we’re pretty much smack in the middle of the historical long term measurements.