rule 34 2021 animal genitalia anus avian balls beak big balls bird black beak black pawpads bubo genus closed eyes day detailed background digital media artwork english text erection feathers felid feral fur genitals grey body grey fur gryphon hybrid lying male mammal medial ring mythological avian mythology nude on side outside owl pantherine pawpads paws penis plant quadruped salonkitty sheath smile snow snow leopard snowy owl solo spots spotted body spotted fur spread legs spreading text tree true owl url white body white feathers wings 5418975