Your logo is pretty similar to the one from Infogrames (well, both show an armadillo):
I'm sorry, but IMHO the logos have some significant differences. The Infograme is looking to the other direction, the proportions are far from similar etc.
It's OK to change the logo to avoid legal issues, but I don't think the infograme people have all the rights on their side. First one should aks them to provide a copy of their trademark registration papers to see how far they can go.
An armadillo is an armadillo. One way out would be to find a nice graphic of an armadillo in a book that's more then 90 years old. These graphics are not copyrighted anymore :-) Use this as a logo and make sure to correctly name the source of the picture.
There's always more then one way out :-)
Jan Wildeboer