患有假性黑化症的孟加拉虎,被称为“忧鬱老虎”。(图撷取自社交平台“X”/@ParveenKaswan) The black tigers of #India. Do you know there are pseudo- melanistic tigers found in Simlipal. They are such due to genetic mutation & highly rare. Such beautiful creature. pic.twitter.com/X1TEw8r1cD — Parv...