diff --git a/data/json/monsters/bird.json b/data/json/monsters/bird.json
index 5033ee6aaa325..7ed52fab2bc2c 100644
--- a/data/json/monsters/bird.json
+++ b/data/json/monsters/bird.json
@@ -261,7 +261,7 @@
     "id": "mon_chickadee_chick",
     "type": "MONSTER",
     "copy-from": "mon_generic_chick_tiny",
-    "upgrades": { "age_grow": 7, "into": "mon_chickadee" }
+    "upgrades": { "age_grow": 28, "into": "mon_chickadee" }
   },
   {
     "id": "mon_waxwing",
@@ -278,7 +278,7 @@
     "id": "mon_waxwing_chick",
     "type": "MONSTER",
     "copy-from": "mon_generic_chick_tiny",
-    "upgrades": { "age_grow": 8, "into": "mon_waxwing" }
+    "upgrades": { "age_grow": 32, "into": "mon_waxwing" }
   },
   {
     "id": "mon_duck",
@@ -303,7 +303,7 @@
       "feed": "The %s seems to like you!  It runs around your legs and seems friendly.",
       "pet": "The %s runs around your leg."
     },
-    "upgrades": { "age_grow": 60, "into": "mon_duck" },
+    "upgrades": { "age_grow": 240, "into": "mon_duck" },
     "//": "A year to reach sexual maturity, so lets assume 2/3 of that time to reach roughly adult size."
   },
   {
@@ -335,7 +335,7 @@
       "feed": "The %s seems to like you!  It runs around your legs and seems friendly.",
       "pet": "The %s runs around your leg."
     },
-    "upgrades": { "age_grow": 49, "into": "mon_duck_domestic" },
+    "upgrades": { "age_grow": 196, "into": "mon_duck_domestic" },
     "//": "28 weeks to start laying eggs for pekins."
   },
   {
@@ -379,7 +379,7 @@
       "feed": "The %s seems to like you!  It runs around your legs and seems friendly.",
       "pet": "The %s runs around your leg."
     },
-    "upgrades": { "age_grow": 75, "into": "mon_turkey" }
+    "upgrades": { "age_grow": 300, "into": "mon_turkey" }
   },
   {
     "id": "mon_turkey_domestic",
@@ -410,7 +410,7 @@
       "feed": "The %s seems to like you!  It runs around your legs and seems friendly.",
       "pet": "The %s runs around your leg."
     },
-    "upgrades": { "age_grow": 75, "into": "mon_turkey_domestic" }
+    "upgrades": { "age_grow": 300, "into": "mon_turkey_domestic" }
   },
   {
     "id": "mon_pheasant",
@@ -433,7 +433,7 @@
     "copy-from": "mon_generic_chick",
     "name": { "str": "yellow chick" },
     "description": "A tiny yellow and brown chick, it could be from a number of different species.",
-    "upgrades": { "age_grow": 14, "into": "mon_chicken" },
+    "upgrades": { "age_grow": 56, "into": "mon_chicken" },
     "petfood": {
       "food": [ "BIRDFOOD" ],
       "feed": "The %s seems to like you!  It runs around your legs and seems friendly.",
@@ -444,7 +444,7 @@
     "id": "mon_grouse_chick",
     "type": "MONSTER",
     "copy-from": "mon_generic_chick",
-    "upgrades": { "age_grow": 30, "into": "mon_grouse" }
+    "upgrades": { "age_grow": 120, "into": "mon_grouse" }
   },
   {
     "id": "mon_crow_chick",
@@ -457,37 +457,37 @@
     },
     "volume": "67 ml",
     "weight": "50 g",
-    "upgrades": { "age_grow": 36, "into": "mon_crow" }
+    "upgrades": { "age_grow": 144, "into": "mon_crow" }
   },
   {
     "id": "mon_raven_chick",
     "type": "MONSTER",
     "copy-from": "mon_crow_chick",
-    "upgrades": { "age_grow": 35, "into": "mon_raven" }
+    "upgrades": { "age_grow": 140, "into": "mon_raven" }
   },
   {
     "id": "mon_bluejay_chick",
     "type": "MONSTER",
     "copy-from": "mon_generic_chick_tiny",
-    "upgrades": { "age_grow": 10, "into": "mon_bluejay" }
+    "upgrades": { "age_grow": 40, "into": "mon_bluejay" }
   },
   {
     "id": "mon_cardinal_chick",
     "type": "MONSTER",
     "copy-from": "mon_generic_chick_tiny",
-    "upgrades": { "age_grow": 10, "into": "mon_cardinal" }
+    "upgrades": { "age_grow": 40, "into": "mon_cardinal" }
   },
   {
     "id": "mon_robin_chick",
     "type": "MONSTER",
     "copy-from": "mon_generic_chick_tiny",
-    "upgrades": { "age_grow": 7, "into": "mon_robin" }
+    "upgrades": { "age_grow": 28, "into": "mon_robin" }
   },
   {
     "id": "mon_sparrow_chick",
     "type": "MONSTER",
     "copy-from": "mon_generic_chick_tiny",
-    "upgrades": { "age_grow": 7, "into": "mon_sparrow" }
+    "upgrades": { "age_grow": 28, "into": "mon_sparrow" }
   },
   {
     "id": "mon_pheasant_chick",
@@ -498,14 +498,14 @@
       "feed": "The %s seems to like you!  It runs around your legs and seems friendly.",
       "pet": "The %s runs around your leg."
     },
-    "upgrades": { "age_grow": 55, "into": "mon_pheasant" },
+    "upgrades": { "age_grow": 222, "into": "mon_pheasant" },
     "//": "A year to reach sexual maturity, but only 80 days to reach independence, so lets get an average from that."
   },
   {
     "id": "mon_goose_canadian_chick",
     "type": "MONSTER",
     "copy-from": "mon_generic_chick_water",
-    "upgrades": { "age_grow": 135, "into": "mon_goose_canadian" },
+    "upgrades": { "age_grow": 547, "into": "mon_goose_canadian" },
     "//": "A year to reach independence, 2-3 years to reach sexual maturity, so lets assume 1.5 years to reach full size."
   },
   {
@@ -636,7 +636,7 @@
       "feed": "The %s seems to like you!  It runs around your legs and seems friendly.",
       "pet": "The %s runs around your leg."
     },
-    "upgrades": { "age_grow": 53, "into": "mon_goose" }
+    "upgrades": { "age_grow": 212, "into": "mon_goose" }
   },
   {
     "id": "mon_hummingbird",
@@ -666,13 +666,13 @@
     "id": "mon_hummingbird_chick",
     "type": "MONSTER",
     "copy-from": "mon_generic_chick_tiny",
-    "upgrades": { "age_grow": 6, "into": "mon_hummingbird" }
+    "upgrades": { "age_grow": 24, "into": "mon_hummingbird" }
   },
   {
     "id": "mon_woodpecker_chick",
     "type": "MONSTER",
     "copy-from": "mon_generic_chick_tiny",
-    "upgrades": { "age_grow": 6, "into": "mon_woodpecker" }
+    "upgrades": { "age_grow": 24, "into": "mon_woodpecker" }
   },
   {
     "id": "mon_coot",
@@ -725,26 +725,26 @@
     "id": "mon_coot_chick",
     "type": "MONSTER",
     "copy-from": "mon_generic_chick_water",
-    "upgrades": { "age_grow": 23, "into": "mon_coot" }
+    "upgrades": { "age_grow": 92, "into": "mon_coot" }
   },
   {
     "id": "mon_cormorant_chick",
     "type": "MONSTER",
     "copy-from": "mon_generic_chick_water",
-    "upgrades": { "age_grow": 97, "into": "mon_cormorant" },
+    "upgrades": { "age_grow": 400, "into": "mon_cormorant" },
     "//": "2 years to reach sexual maturity, but only 10 weeks to reach independence, so lets get an average from that."
   },
   {
     "id": "mon_moorhen_chick",
     "type": "MONSTER",
     "copy-from": "mon_generic_chick_water",
-    "upgrades": { "age_grow": 22, "into": "mon_moorhen" }
+    "upgrades": { "age_grow": 88, "into": "mon_moorhen" }
   },
   {
     "id": "mon_grebe_chick",
     "type": "MONSTER",
     "copy-from": "mon_generic_chick_water",
-    "upgrades": { "age_grow": 60, "into": "mon_grebe" },
+    "upgrades": { "age_grow": 240, "into": "mon_grebe" },
     "//": "A year to reach sexual maturity, so lets assume 2/3 of that time to reach roughly adult size."
   },
   {
@@ -770,7 +770,7 @@
     "id": "mon_guinea_fowl_chick",
     "type": "MONSTER",
     "copy-from": "mon_chicken_chick",
-    "upgrades": { "age_grow": 28, "into": "mon_guinea_fowl" },
+    "upgrades": { "age_grow": 112, "into": "mon_guinea_fowl" },
     "//": "16 weeks to develop adult plumage and reach maturity."
   }
 ]
diff --git a/data/json/monsters/mammal.json b/data/json/monsters/mammal.json
index e98800f95f3eb..e711ac896dada 100644
--- a/data/json/monsters/mammal.json
+++ b/data/json/monsters/mammal.json
@@ -894,7 +894,7 @@
     "species": [ "MAMMAL" ],
     "volume": "22 L",
     "weight": "22 kg",
-    "hp": 22,
+    "hp": 34,
     "speed": 155,
     "material": [ "flesh" ],
     "symbol": "d",
@@ -947,9 +947,9 @@
     "name": { "str": "coyote pup" },
     "description": "A cute coyote pup.  Despite the temptation, perhaps it is wise to refrain from petting it.",
     "copy-from": "mon_coyote",
-    "volume": "750 ml",
+    "volume": "1 L",
     "weight": "1 kg",
-    "hp": 5,
+    "hp": 2,
     "speed": 98,
     "aggression": -13,
     "morale": 8,
@@ -961,7 +961,7 @@
     "stomach_size": 150,
     "vision_night": 15,
     "harvest": "dog_tiny_with_skull",
-    "upgrades": { "age_grow": 68, "into": "mon_coyote" },
+    "upgrades": { "age_grow": 270, "into": "mon_coyote" },
     "//": "9 months to reach adult size. 2 years to reach sexual maturity, but we don't necessarily model that.",
     "zombify_into": "",
     "burn_into": "",
diff --git a/data/json/monsters/mutant_mammal.json b/data/json/monsters/mutant_mammal.json
index 47bb33f4a119b..7cf5d9175479f 100644
--- a/data/json/monsters/mutant_mammal.json
+++ b/data/json/monsters/mutant_mammal.json
@@ -156,7 +156,7 @@
     "description": "A cute coyote pup.  Though, on a closer look, something is off about it.",
     "copy-from": "mon_coyote_pup",
     "melee_damage": [ { "damage_type": "cut", "amount": 4 } ],
-    "upgrades": { "age_grow": 68, "into": "mon_coyote_mutant_shark" },
+    "upgrades": { "age_grow": 270, "into": "mon_coyote_mutant_shark" },
     "harvest": "dog_tiny_with_skull_mutant"
   },
   {
@@ -180,7 +180,7 @@
     "description": "A cute coyote pup.  Though, on a closer look, something is off about it.",
     "copy-from": "mon_coyote_pup",
     "melee_damage": [ { "damage_type": "cut", "amount": 2 } ],
-    "upgrades": { "age_grow": 68, "into": "mon_coyote_mutant_venom" },
+    "upgrades": { "age_grow": 270, "into": "mon_coyote_mutant_venom" },
     "harvest": "dog_tiny_with_skull_mutant",
     "extend": { "flags": [ "BADVENOM" ] }
   },
diff --git a/data/json/monsters/reptile_amphibian.json b/data/json/monsters/reptile_amphibian.json
index 7c0c5d7fce6cd..7d64d83d46e5f 100644
--- a/data/json/monsters/reptile_amphibian.json
+++ b/data/json/monsters/reptile_amphibian.json
@@ -125,7 +125,7 @@
     "name": { "str": "timber rattlesnake snakelet" },
     "description": "A timber rattlesnake in its hatchling stage.  It will eventually grow a rattle and learn how to hunt.",
     "copy-from": "mon_snakelet_abstract",
-    "upgrades": { "age_grow": 365, "into": "mon_rattlesnake" },
+    "upgrades": { "age_grow": 1460, "into": "mon_rattlesnake" },
     "extend": { "flags": [ "VENOM" ] }
   },
   {
@@ -166,7 +166,7 @@
     "description": "A garter snake in its juvenile stage.",
     "copy-from": "mon_snakelet_abstract",
     "default_faction": "snake_tiny_aquatic",
-    "upgrades": { "age_grow": 136, "into": "mon_gartersnake" }
+    "upgrades": { "age_grow": 544, "into": "mon_gartersnake" }
   },
   {
     "id": "mon_wormsnake",
@@ -193,7 +193,7 @@
     "description": "A worm snake in its hatchling stage.  Not that much smaller than an adult, actually.",
     "default_faction": "lizard_tiny",
     "copy-from": "mon_snakelet_abstract",
-    "upgrades": { "age_grow": 75, "into": "mon_wormsnake" },
+    "upgrades": { "age_grow": 300, "into": "mon_wormsnake" },
     "extend": { "fear_triggers": [ "BRIGHT_LIGHT" ] }
   },
   {
@@ -214,7 +214,7 @@
     "name": { "str": "painted turtle hatchling" },
     "description": "A painted turtle in its hatchling stage.",
     "copy-from": "mon_turtle_baby_abstract",
-    "upgrades": { "age_grow": 548, "into": "mon_turtle_painted" },
+    "upgrades": { "age_grow": 2190, "into": "mon_turtle_painted" },
     "//": "In northmost regions of the range we're looking at 6 years as an absolute minimum to reach adulthood."
   },
   {
@@ -243,7 +243,7 @@
     "description": "A common snapping turtle in its hatchling stage.",
     "copy-from": "mon_turtle_baby_abstract",
     "default_faction": "turtle_small_predator",
-    "upgrades": { "age_grow": 1095, "into": "mon_turtle_snapping_common" },
+    "upgrades": { "age_grow": 4380, "into": "mon_turtle_snapping_common" },
     "//": "12 years to reach maturity. It should probably be 15 years, because we're reaching the Northern range of the species in the setting, but odds are nobody is ever gonna see those grow to adulthood anyway."
   },
   {
@@ -291,7 +291,7 @@
     "morale": -20,
     "vision_day": 16,
     "vision_night": 3,
-    "upgrades": { "age_grow": 75, "into": "mon_skink_fivelined" },
+    "upgrades": { "age_grow": 300, "into": "mon_skink_fivelined" },
     "//": "Sexual maturity at 2-3 years, but there's no way in hell they don't reach adult size before that, so we take 10 months as a fairly safe guesstimate.",
     "extend": { "flags": [ "NO_BREED" ] }
   },
diff --git a/data/mods/TropiCataclysm/monsters/tropical_bird.json b/data/mods/TropiCataclysm/monsters/tropical_bird.json
index 956d780ab4662..80c8052e36cef 100644
--- a/data/mods/TropiCataclysm/monsters/tropical_bird.json
+++ b/data/mods/TropiCataclysm/monsters/tropical_bird.json
@@ -96,7 +96,7 @@
     "id": "mon_toucan_chick",
     "type": "MONSTER",
     "copy-from": "mon_generic_chick",
-    "upgrades": { "age_grow": 35, "into": "mon_toucan" },
+    "upgrades": { "age_grow": 144, "into": "mon_toucan" },
     "//": "Copied from the vanilla corvids. ~8 weeks to fledge, but couldn't find any info on how long it takes for them to reach adult size. Sexual maturity is a bad metric as they reach it very late, at 3-4 years of age."
   },
   {
@@ -114,8 +114,8 @@
     "id": "mon_parrot_chick",
     "type": "MONSTER",
     "copy-from": "mon_generic_chick_tiny",
-    "upgrades": { "age_grow": 12, "into": "mon_parrot" },
-    "//": "12 days to reach independence. Use the default multiplier of 4 to our advantage to get a rough estimate of reaching adult size.",
+    "upgrades": { "age_grow": 48, "into": "mon_parrot" },
+    "//": "12 days to reach independence. Use a multiplier of 4 to our advantage to get a rough estimate of reaching adult size.",
     "petfood": {
       "food": [ "BIRDFOOD" ],
       "feed": "The %s seems to like you!  It runs around your legs and seems friendly.",
@@ -138,7 +138,7 @@
     "id": "mon_macaw_chick",
     "type": "MONSTER",
     "copy-from": "mon_generic_chick",
-    "upgrades": { "age_grow": 23, "into": "mon_macaw" },
+    "upgrades": { "age_grow": 90, "into": "mon_macaw" },
     "//": "3 months to reach independence.",
     "petfood": {
       "food": [ "BIRDFOOD" ],
@@ -162,7 +162,7 @@
     "id": "mon_finch_saffron_chick",
     "type": "MONSTER",
     "copy-from": "mon_generic_chick_tiny",
-    "upgrades": { "age_grow": 8, "into": "mon_finch_saffron" }
+    "upgrades": { "age_grow": 32, "into": "mon_finch_saffron" }
   },
   {
     "id": "mon_great_kiskadee",
@@ -180,7 +180,7 @@
     "id": "mon_great_kiskadee_chick",
     "type": "MONSTER",
     "copy-from": "mon_generic_chick_tiny",
-    "upgrades": { "age_grow": 10, "into": "mon_great_kiskadee" }
+    "upgrades": { "age_grow": 40, "into": "mon_great_kiskadee" }
   },
   {
     "id": "mon_rufous_hornero",
@@ -196,8 +196,7 @@
     "id": "mon_rufous_hornero_chick",
     "type": "MONSTER",
     "copy-from": "mon_generic_chick_tiny",
-    "upgrades": { "age_grow": 25, "into": "mon_rufous_hornero" },
-    "//": "24-26 days to reach independence. Use the default multiplier of 4 to our advantage to get a rough estimate of reaching adult size."
+    "upgrades": { "age_grow": 40, "into": "mon_rufous_hornero" }
   },
   {
     "id": "mon_tinamou",