Here are some other free (as of Thursday, Nov. 20th, 2014) .bio domains:
quantitative.bio
mathematical.bio
statistical.bio
experimental.bio
developmental.bio
population.bio
pop.bio
socio.bio
mol.bio
behavioral.bio
genomic.bio
proteomic.bio
genetical.bio
geographical.bio
spatial.bio
globalchange.bio
comparative.bio
astro.bio
structural.bio
mechanical.bio
cognitive.bio
metabolic.bio
animal.bio
mammal.bio
hum.bio
vertebrate.bio
invertebrate.bio
wildlife.bio