Because these alleles are rare in the wild, expressing albinism in captivity often requires mating closely related individuals.
| Condition | Melanin? | Eye Color | Zoo Example | |-----------|----------|-----------|--------------| | | None | Pink/red (blood vessels) | Albino wallaby | | Leucism | Reduced (patchy) | Normal | White tiger | | Melanism | Excess | Normal | Black jaguar | | Chimerism | Mixed cell lines | Normal | Tortoiseshell male cat | Because these alleles are rare in the wild,