As you probably know, spiders and birds aren’t the only ones who know how to weave. Weaver ants (mostly ants of the genus Oecophylla) are named because the worker ants use silk produced by their larvae to sew or weave together leaves in trees to make a nest to live in.
Photo by Robin Klein at Wikimedia
To do this, worker ants form a living chain between nearby leaves in a tree and bring leaf edges together. Other workers carry the legless larvae to the edges and give them the signal to spit up silk. As the worker ants move the larvae back and forth, the leaves are bound together into a cluster. The ants use the leafy clusters as nests.
This short video from Discovery shows the workers in action. (Glue?)
Weaver ants are elegant, long-legged ants.
Photo source Sean.hoyland at Wikimedia
Some species of weaver ants are also known as green ants due to the greenish color of their rear sections (gasters). They are called citrus ants or orange ants because they are used to protect fruit in citrus orchards. Weaver ants guard their homes with vigor and attack and eat any arthropods in the vicinity.
Photograph by Axel Rouvin at Wikimedia
As far as is known, the ancient Chinese were the first to use these ants to control pests and protect crops. Around 1,700 years ago, farmers employed weaver ants to keep caterpillars, stink bugs and small rodents out of their valuable citrus orchards. Farmers could stroll down to their local market, buy ant nests full of ants and put them out into their orchards. Evidence suggests the farmers actually provided platforms or runways so the weaver ants could run from tree to tree.
So, that’s ancient history, right? Those were times before pesticides and modern technology. Who needs ants now?
In fact, in the later part of the twentieth century many growers did switch to using pesticides to protect their crops. Soon, because of the high costs of pesticides, and other problems associated with pesticide use, farmers quit using them and began using ants again in their orchards. Today farmers in Asia and Northern Australia rely on weaver ants to control pests of mango, coconut, oil palm and cashew orchards.
In fact, there was just an Internet article that mango and cashew growers in Africa are going to start using weaver ants to protect their crops as well.
There is an intriguing fictional children's book that incorporates what is known about the ancient Chinese practice of using weaver ants in orchards called Ma Jiang & The Orange Ants by Barbara Ann Porte and illustrated by Annie Cannon.
Another video of weaver ants showing queens clustered in a leaf.
I would love to see weaver ants in real life someday. I think they are amazing.
Have you ever seen weaver ants in action?