Matheus Chaud (asker) Mar 29, 2016:

@Muriel I appreciate your advice, Muriel. I thought mentioning "formigas" and "castas" (ants and castes) would be enough to receive some suggestions, since the concept of castes is relatively common in social insects. Anyway, you are right - the more information, the better. Thanks for your help!

Muriel Vasconcellos Mar 29, 2016:

@ Mateus Providing more context would have saved answerers a lot of trouble.

Matheus Chaud (asker) Mar 29, 2016:

Something useful I've found something interesting:

http://test.glossopedia.org/leafcutter-ants/

Leafcutter ants have more castes than any other species of ant. There are 22 different community jobs the colony caste members must perform.

I guess the author means that they have the largest caste structure of all social insects, or something like that.

Matheus Chaud (asker) Mar 29, 2016:

Castes Hi, Muriel,

It's about their caste system (their "social structure", let's say). The text is about leaf-cutting ants and their ecological significance.

Thanks!

Muriel Vasconcellos Mar 29, 2016:

earthworm cast(ing)s? Since ants eat earthworms, maybe they also ingest their cast(ing)s. *More context would help. What is the general subject of your text?*

https://www.youtube.com/watch?v=1jgnPiBrCwY
Oct 17, 2011 - Uploaded by MidNightRider2001
Ants eat an earthworm in about 24 hours. tags; Science nature ant ants worm earthworm earth worm food ...