Cyclopeeze seems to get mine excited.
Note: if you ever get a 'gap' in the heads, break the specimen in half and glue the sections against each other, curve for curve: I got a 'gappy' specimen, saw how they 'like' to be, ridge after ridge snugged up against each other, and split and glued mine---what was an 'iffy' little fox began to be a very happy, hungry fox---somehow the extra folds help it get food.