Oviposition is the process of laying eggs, which is a natural reproductive step for most fishes, amphibians, reptiles, birds, and monetremes. Evolutionary science suggests that all animals once laid eggs, but many animals evolved into live birth for improved survival of offspring.

As a tag, oviposition describes eggs exiting a body into an external environment, usually from an orifice like a pussy or ovipositor but also from more fetishized regions like an anus, urethra, or even a tentacle. An oviposition post may suggest that a body will lay one or a few eggs, or perhaps that a single body will lay a clutch of tens or even hundreds of eggs.


The oviposition tag requires requires current egg-laying.

imminent oviposition

Eggs are not visible from the exterior of a body, but we know that a character is in labor with egg(s) or that egg(s) are now being conveyed from within a body to an orifice. Do not tag this with oviposition.

during oviposition

1. An egg is exiting an orifice, often stuck and requires straining from the egg-layer to push it out. This may resemble crowning, the stage of birth where only the top of the child's head is visible, but that tag should remain separate from oviposition.

2. An egg has completely exited the body just moments ago. There may be:

  • motion_lines indicating the egg's travel or shaking from the egg-layer's body
  • bodily_fluids still connecting the egg to the egg-layer (i.e., [fluid_type]_string tag) or such a trail between the egg and its exited orifice
  • gaping_[orifice] that the egg exited

3. (Optional) The egg-layer appears to have more eggs to lay and the cycle repeats. Signs for this may include:

  • continued straining, pain, shaking, or muscle tension
    • be aware that a body exiting labor should still exhibit similar aftershocks as it returns to a neutral state
  • internal view showing more eggs
  • various round [body_part]_bulges where the egg was stored within the body (e.g., abdominal_bulge) or along the path it exited (e.g., urethral_bulge)
  • big_belly should be regarded with plenty of skepticism for this because bellies shouldn't magically deflate to pre-pregnancy proportions moments after oviposition
    • at best, a judgment call can be made between current belly size, expected non-pregnant belly size, and the volume of eggs already laid (e.g., very large belly + low relative volume of eggs laid = very likely more eggs will be laid)
after oviposition

Oviposition of all eggs is complete. Some amount of freshly laid eggs are present, perhaps still wet with bodily_fluids. The egg-laying character may appear exhausted, relieved, relaxed, or happy but not tense or pained. In many cases with art, the once-pregnant character recovers impossibly fast, where their body proportions immediately return to normal sizes and they may even appear ready for physical activity.

Tagging Issues

birth - eggs are not born. Never tag oviposition with birth. Moreover, newborn babies are countable characters but eggs are not.

  • birth subtags - never tag oviposition with any birth subtags. Ever. Use an equivalent oviposition tag instead or create one if needed.

abdominal_bulge / other bulges - only tag egg-bearing body parts with [body_part]_bulge tags when those body parts have egg bulges. A perfectly round belly known to contain eggs should not be tagged abdominal_bulge.

egg_insertion - this is not oviposition unless the egg has first exited one body, such as via ovipositor or egg laying tentacle, before being inserted into a body.

  • egg_play - using an egg as an improvised_sex_toy, where the egg may be inserted into and removed from an orifice multiple times, falls outside the intent of the oviposition tag. If the egg originated from the orifice, then oviposition still applies.

hatching - the organism within an egg has finished its egg-bound development, cracks its shell, and emerges. This is neither oviposition nor birth.

  • internal_hatching - in very rare cases eggs hatch within a character and then the offspring exits the character. Tag this birth and not oviposition. Some real egg-laying animals can switch to live births as they adapt to their environment.

larva - these develop from eggs and are not eggs themselves.

parasite / infestation - a harmful foreign creature that has somehow entered or attached to a host body and consumes its nutrients. By definition, a host infested with parasites should never count toward pregnancy and therefore oviposition; however, parasitism in art has unusual variations and must be judged on a case-by-case basis.

For instance, parasitism involving corruption and/or assimilation could feature oviposition. For the sake of simplicity, a parasite's eggs exiting a host body is still oviposition.

penetration - eggs exiting a body never count as penetration. Tag with the correct [orifice]_oviposition tag instead of any penetration tags.

pregnancy - this is the development of offspring within a character, including eggs. Thus, offspring currently exiting a character's body are no longer considered developing within that body and do not count toward pregnancy. Regardless, furry pregnancy art often features multiple offspring and determining if an ovipositing character has more eggs within them often isn't possible.

See also

The following tags are aliased to this tag: egglaying, laying_egg, laying_eggs, ovipositioning, egg_laying, ovi (learn more).

This tag implicates egg (learn more).

The following tags implicate this tag: egg_from_mouth, egg_from_pussy, egg_from_cloaca, egg_from_nipples, egg_from_ovipositor, egg_from_urethra, egg_from_ass, forced_oviposition (learn more).

Posts (view all)

2024 accessory amy_rose anthro anus belly belly_squish big_belly big_breasts big_butt black_nose blue_egg blush breasts brown_nipples butt cel_shading colored digital_media_(artwork) egg egg_from_ass egg_from_pussy english_text eulipotyphlan eyelashes female genitals gl4zedd0nuts green_eyes hair hair_accessory hairband hammer hedgehog hi_res holding_object huge_belly huge_breasts hyper hyper_belly hyper_breasts hyper_nipples hyper_pregnancy immobile lying mammal mobian_hedgehog nipples on_front open_mouth oviposition pink_background pink_body pink_ears pink_hair pink_tail pregnant pregnant_female pussy red_hairband sega shaded side_view simple_background solo sonic_the_hedgehog_(series) squish stretched_anus stretched_pussy tail tan_belly tan_breasts tan_inner_ear text thick_thighs tools
anal anal_penetration animal_genitalia animal_pussy anus asphyxiation bdsm bodily_fluids bondage bound breast_milking breasts butt canid canine canine_genitalia canine_pussy choking dripping egg egg_in_ass egg_in_mouth egg_insertion eggnant ejaculation female feral fox fur gaping gaping_anus genital_fluids genitals hi_res kaimstain lactating mammal milk milk_drip multi_breast multi_nipple nat_127 nipples oral oral_penetration orange_body orange_fur oviposition panicking paws penetration pregnant pubes public pussy pussy_ejaculation pussy_juice_drip sex solo spread_butt spread_legs spreading tail tail_grab tentacle_penetration tentacle_sex tentacles vaginal_fluids white_body white_fur yellow_eyes
3_toes alpha_channel anal_oviposition anthro anus avian beak big_butt bird butt chicken critters_(poppy_playtime) egg feathers feet galliform gallus_(genus) gesture grin hand_gesture huge_butt kickinchicken looking_at_viewer looking_back looking_pleasured lyrad18 male oviposition phasianid pink_anus poppy_playtime simple_background smile smiling_critters solo spread_anus spread_butt spread_legs spreading stretched_anus thick_thighs thumbs_up toes transparent_background yellow_body yellow_feathers
2024 absurd_res animal_humanoid arachnid arachnid_humanoid arthropod arthropod_humanoid bdsm breast_play breasts butt cat_tail clothing comic dark_hair duo egg felid felid_humanoid feline feline_humanoid female female/female fran_(reincarnated_as_a_sword) genitals hair hi_res humanoid hybrid interspecies legwear liquid male mammal mammal_humanoid manga monster monster_girl_(genre) nipples open_mouth organs oviposition ovipositor_penis penetration purple_eyes pussy reincarnated_as_a_sword sex spider spider_humanoid spider_web stockings stomach tabaarus teeth tensei_shitara_ken_deshita tongue vaginal vaginal_penetration white_hair