I should talk a bit more about leech and lamprey

[aleifer]

See especially:

http://www.ncbi.nlm.nih.gov.ezp-prod1.hul.harvard.edu/entrez/query.fcgi?holding=npg&cmd=Retrieve&db=PubMed&list_uids=8757786&dopt=Abstract

or reference 19 in the original colbert paper