A list of existing chromosome count databases can be found below. This list is not extensive nor restricted to animals only.
Animals
Chromosomes of Russian mammals
Chromorep: a reptiles chromosomes database
Plants
BSBI cytology search form
Chilean plants cytogenetic database
Chromosome counts for Malvaceae
“Flora” section of Biocat
Flora of North America
Karyological database of the genus Cardamine
Karyological database of ferns and flowering plants of Slovakia
Index to CNs in Asteraceae
Index of CNs of indigenous New Zealand vascular plants
The Chromosome Count Database
Index to plant CNs
Prota4U
Published chromosome counts in Hieracium
Worldwide database of published CNs in Onosma
Animals and plants
Tree of sex
Genome Size Database