Difference in hatchlings’ sizes of 4 leopard geckos’ species

Look at the difference in hatchlings’ sizes of 4 leopard geckos’ species. In one box you сan see E. angramainyu (Iranian leopard gecko, natural range: Iraq, Iran, Turkey and Syria); E. hardvickii (East Indian leopard gecko, natural range: eastern India, Bangladesh); E. fuscus (West Indian leopard gecko, natural range: western India, Pakistan) and E. macularius (Common leopard gecko, natural range: south-Asian Afghanistan, Pakistan, northwestern India, and some parts of Iran). All juveniles show wild-type co