Skip to main content

Yellow Sac Spider

There are a couple of species that go by the common name "Yellow Sac Spider," but the specific one that we will be talking about today is Cheirachanthium punctorium (what a mouthful!)

These spiders, which are found in Central Europe and Asia, grow to about 15mm in length. They get their name from their yellow coloration, and from their egg-laying behavior.

Females build large (compared to their bodies) egg sacs in the grass, and they defend these 4cm long pouches very aggressively. And their aggression should be taken somewhat seriously! Their bites can actually pierce human skin, and cause reactions similar to a wasp sting in most humans (though some people will of course react in worse way).

IUCN Status : Not Listed
Location : Europe, Asia
Size : Body length up to 15mm
Classification : Phylum : Arthropoda -- Class : Arachnida -- Order : Araneae
Family : Miturgidae -- Genus : Cheiracanthium -- Species : C. punctorium
Image : Rainer Altenkamp


Popular posts from this blog

Bornean Orangutan

The Bornean Orangutan is one of two extant Orangutan species in the world. It is the third largest primate (after Gorillas) and is the largest primarily tree-dwelling animal in the world. Males are substantially larger than females, and average at around 165lbs. Bornean Orangutans are largely solitary. A handful might live within a small range but they will seldom interact with one another. Males and females only meet up to breed, which happens only once every several years. A young Orangutan will stay with it's mother for about five years, and the females tend to go about eight years between births. That is the longest interim period of any animal! Sadly, the Bornean Orangutans are in a lot of trouble. They need large forests in order to thrive, and deforestation and habitat degradation has left many homeless. They are also hunted for meat and for traditional medicines. Conservation areas are being established to help these guys in the wild, and it is believed that there are a


For anyone who was counting, yesterday was our birthday-- four years! Four years filled with animals from A to Z, more than 1,100 of them! I can't thank my readers enough, it's been wonderful! And in celebration of that milestone... I'm taking a break. Hopefully not forever, but for a little bit at least. In the mean time I plan on getting a new layout out, along with some updates to some of the older articles. I'll post updates here and on the Facebook page, I'm also brainstorming some new animal-related projects, so keep an eye out! Thanks again for four awesome years!

10 Years?!

My goodness! It's been 6 years since I went on hiatus, and now more than 10 years since AaD was born, and what a world we've moved in to! Animal a Day is coming back- but in the meantime, check us out on Facebook, for your daily dose of #BIRDNEWS