I have used etology and found it highly unreliable. Sometimes ads don't show or just vanish and reappear throughout the day making my site look very messy. The payout was stupidly low too. I don't bother with them anymore.
Etology does business with avnads, a partner of adbrite before. I see many websites using etology. But the etology ads look bad, the same ads repeated many times on one page. Their pay rate is as low as adengage.
They have many publishers but few advertisers It seems they only show ads of Various, Inc (adultfriendfinder)
Etology used to power Adbright (with adult advertising), both are advertising networks mainly known as adult advertising networks. However, Adbright is more versatile in terms of it's market. I think Etology specialised in Adult advertising and adult advertising is one part of the business of Adbright. Etology no longer powers Adbright.