diff --git a/code/__SANDCODE/DEFINES/traits.dm b/code/__SANDCODE/DEFINES/traits.dm
index a062d75fb6..92799a3fdf 100644
--- a/code/__SANDCODE/DEFINES/traits.dm
+++ b/code/__SANDCODE/DEFINES/traits.dm
@@ -8,3 +8,6 @@
 #define TRAIT_INFERTILE			"infertile"
 /// DNC trait, used to prevent cloning
 #define TRAIT_DNC_ORDER			"dnc_order"
+/// Estrous traits, used for mammalian seasonal arousal systems
+#define TRAIT_ESTROUS_ACTIVE	"estrous_active"
+#define TRAIT_ESTROUS_DETECT	"estrous_detect"
diff --git a/html/changelogs/archive/2023-02.yml b/html/changelogs/archive/2023-02.yml
index e7c8e502ce..6b359fb8ce 100644
--- a/html/changelogs/archive/2023-02.yml
+++ b/html/changelogs/archive/2023-02.yml
@@ -5,3 +5,7 @@
   - tweak: Hypnotic Gaze accounts for non-con preferences
   - balance: Hypnotic Gaze interaction time reduced from 12s to 5s
   - balance: Hypnotic Gaze can be blocked by eye protection and mind shielding
+  - rscadd: Added quirk Estrous Detection
+  - rscadd: Added quirk In Estrous
+  - tweak: Ashwalkers now spawn with the Estrous Detection quirk
+  - tweak: Ashwalkers will now gain the In Estrous quirk during some rounds
diff --git a/modular_sand/code/datums/traits/neutral.dm b/modular_sand/code/datums/traits/neutral.dm
index 89486dc153..363f6f7e25 100644
--- a/modular_sand/code/datums/traits/neutral.dm
+++ b/modular_sand/code/datums/traits/neutral.dm
@@ -22,3 +22,41 @@
 	lose_text = span_love("You feel the warm blow of life flooding your womb, full of newfound, vibrant fertility!")
 	medical_record_text = "Patient doesn't seem able to ovulate properly..."
 */
+
+/datum/quirk/estrous_detection
+	name = "Estrous Detection"
+	desc = "You have a mammalian sense of detecting if someone\'s body longs for breeding."
+	value = 0
+	mob_trait = TRAIT_ESTROUS_DETECT
+	gain_text = span_love("Your senses adjust, allowing a mammalian sense of others' fertility.")
+	lose_text = span_notice("Your sense of others' fertility fades.")
+
+/datum/quirk/estrous_active
+	name = "In Estrous"
+	desc = "Your system burns with the desire to be bred. Satisfying your lust will make you happy, while ignoring it may cause you to become sad and needy."
+	value = 0
+	mob_trait = TRAIT_ESTROUS_ACTIVE
+	gain_text = span_love("You body burns with the desire to be bred.")
+	lose_text = span_notice("You feel more in control of your body and thoughts.")
+
+/datum/quirk/estrous_active/add()
+	// Add examine hook
+	RegisterSignal(quirk_holder, COMSIG_PARENT_EXAMINE, .proc/quirk_examine_estrous_active)
+
+/datum/quirk/estrous_active/remove()
+	// Remove examine hook
+	UnregisterSignal(quirk_holder, COMSIG_PARENT_EXAMINE)
+
+/datum/quirk/estrous_active/proc/quirk_examine_estrous_active(atom/examine_target, mob/living/carbon/human/examiner, list/examine_list)
+	SIGNAL_HANDLER
+
+	// Check if human examiner exists
+	if(!istype(examiner))
+		return
+
+	// Check if examiner lacks the trait, or is self examining
+	if(!HAS_TRAIT(examiner, TRAIT_ESTROUS_DETECT) || (examiner == quirk_holder))
+		return
+
+	// Add quirk message
+	examine_list += span_love("[quirk_holder.p_they(TRUE)] [quirk_holder.p_are()] currently influenced by the estrous cycle, and long for breeding.")
diff --git a/modular_sand/code/modules/mob/living/carbon/human/species_types/lizardpeople.dm b/modular_sand/code/modules/mob/living/carbon/human/species_types/lizardpeople.dm
index 505aaeeeca..a238241b79 100644
--- a/modular_sand/code/modules/mob/living/carbon/human/species_types/lizardpeople.dm
+++ b/modular_sand/code/modules/mob/living/carbon/human/species_types/lizardpeople.dm
@@ -1,3 +1,31 @@
+#define ESTROUS_CYCLE_LENGTH 32
+#define ESTROUS_CYCLE_OFFSET 11
+
 /datum/species/lizard/New()
 	mutant_bodyparts += list("ears" = "None")
 	. = ..()
+
+/datum/species/lizard/ashwalker/on_species_gain(mob/living/carbon/human/C, datum/species/old_species)
+	. = ..()
+
+	// Add estrous detect quirk
+	C.add_quirk(/datum/quirk/estrous_detection, SPECIES_TRAIT)
+
+	// Define round ID
+	// Requires a server database to use this
+	var/round_id = text2num(GLOB.round_id) || null
+
+	// Define round mating season value
+	var/round_season = ((round_id + (ESTROUS_CYCLE_OFFSET + 2)) % ESTROUS_CYCLE_LENGTH)
+
+	// Check for mating season
+	// Default to active without variable
+	if((!round_id) || round_season <= 2 && round_season >= 0)
+		// Alert user in chat
+		to_chat(C, span_userlove("It\'s that time again. Your loins lay restless as they await a potential mate."))
+
+		// Add estrous quirk
+		C.add_quirk(/datum/quirk/estrous_active, SPECIES_TRAIT)
+
+#undef ESTROUS_CYCLE_LENGTH
+#undef ESTROUS_CYCLE_OFFSET