General: slit pupils

Characters with straight or oval shaped pupils. It's a feature commonly associated with predators or nocturnal creatures, and has been used in art for a long time to make characters seem more inhuman or evil.

The most commonly known example of this is cats, but this does not apply to most felines, as most big cats (lions, panthers, tigers, etc.) have round pupils. Some species of reptiles, such as vipers (but not all snakes) and crocodiles also have those. Which animals have them or not seems to have more to do with their hunting style (usually ambushing) and their activity periods (crepuscular or nocturnal) than their biological family.

Oval or slit pupils can also be horizontal, as is the case for goats and horses, among others.

Examples:

acru_jovian alpha_channel ambiguous_gender digital_media_(artwork) greyscale monochrome portrait reptile scales scalie simple_background slit_pupils snake solo transparent_background

Rating: Safe
Score: 12
User: Acru
Date: November 29, 2015 :3 arrhythmia bat_pony black_hair cutie_mark dark_theme equine eyelashes fan_character fangs female feral fur hair hi_res horse mammal membranous_wings multicolored_hair my_little_pony nightmare_fuel open_mouth outta_sync pony red_hair simple_background slit_pupils smile solo thestral two_tone_hair white_fur wings yellow_eyes

Rating: Safe
Score: 13
User: ROTHY
Date: February 24, 2016 chest_tuft crescent0100 fangs feline female feral fur grey_fur grey_hair hair hi_res inner_ear_fluff looking_at_viewer mammal one_eye_closed open_mouth simple_background slit_pupils solo teeth tongue tongue_out tuft white_background

Rating: Safe
Score: 4
User: Cat-in-Flight
Date: December 18, 2015

The following tags are aliased to this tag: slitted_eyes, cat_eyes, slit_eyes, slit_pupil, vertical_pupil

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Rating: Explicit
Score: 12
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Rating: Questionable
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User: Cash_Banooca
Date: April 22, 2018 ↑3 ♥30 C0 Q U 2018 5_fingers abs anthro bat biceps big_penis blue_eyes blue_fur blue_hair blue_nose blue_skin eyebrows flying_fox fur hair hand_on_balls hand_on_penis humanoid_penis long_tongue looking_at_viewer male mammal masturbation membranous_wings multicolored_skin muscular muscular_male muscular_thighs nipples nude orange_skin pecs penile_masturbation penis presenting simple_background sitting slit_pupils small_tail smile solo stripes thick_penis tongue tongue_out truegrave9 uncut white_penis white_skin wings

Rating: Explicit
Score: 6
User: DeservantHurricane
Date: April 22, 2018 ↑6 ♥24 C0 E balding box brown_hair clothing comic dragon facial_hair fangs feral hair horn human kogotsuchidark male mammal mustache overweight painting russian_text scales scalie slit_pupils text translated wings yellow_eyes yellow_scales

Rating: Safe
Score: 23
User: snowdude
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Rating: Questionable
Score: 18
User: Blind_Guardian
Date: April 22, 2018 ↑18 ♥83 C1 Q 2018 <3 adidas anthro big_breasts big_butt black_fur black_hair bow breasts butt cat chav cleavage clothed clothing digital_media_(artwork) english_text fangs feline female footwear fur hair mammal minx_kitten nike ponytail shirt shoes shorts simple_background slit_pupils smutbunny solo tank_top text thick_thighs tongue tongue_out track_jacket voluptuous

Rating: Questionable
Score: 6
User: SmutBunny
Date: April 22, 2018 ↑6 ♥56 C0 Q ambiguous_gender armor clothed clothing comic dragon duo english_text fully_clothed helmet monochrome shane_frost slit_pupils text white_text

Rating: Safe
Score: 8
User: rmaster454
Date: April 22, 2018 ↑8 ♥4 C5 S 2018 5_fingers ambiguous_gender anthro anthro_on_anthro balls blue_eyes blue_fur blue_hair blue_penis blurred_background duo erection eyebrows fur grey_fur hair hand_on_penis handjob looking_down male male/ambiguous multicolored_fur penis sergal sex sidgi sitting slit_pupils smile snout solo two_tone_fur

Rating: Explicit
Score: 7
User: DeservantHurricane
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Rating: Explicit
Score: 4
User: DeservantHurricane
Date: April 21, 2018 ↑4 ♥27 C0 E big_breasts big_thighs bra breasts camel_toe clothed clothing elf female huge_breasts humanoid lipstick makeup nana_gel not_furry open_shirt panties shirt slit_pupils solo thigh_gap underwear

Rating: Questionable
Score: 3
User: Nana_Gel
Date: April 21, 2018 ↑3 ♥36 C1 Q