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Yian Kut-Ku

A bird wyvern with a huge beak and large ears that splay open when it is angered. With its sensitive hearing it dislikes loud noises. It is smaller but faster than other wyverns.

A wyvern known as the “Giant Bird,” with power and speed on a whole other level from the small and medium monsters fought before it. It could be called the first wall that stands in the way of novice hunters.
Our translation of モンスターハンターポータブル 2nd G 公式ガイドブック (Enterbrain, 2008), page 212.

Guide book figures for Yian Kut-Ku

Health

Quests	Health	Capture	Limping
Easy, Village Low Rank	820 (640)	30%	20%
Gathering Hall Low Rank	1,720	30%	20%
Village High Rank	- (907)	18%	12%
Gathering Hall High Rank	2,080 (1,240)	18%	12%
G-Level	3,160 (2,120)	15%	10%

Capture and Limping are the share of health left when it can be captured and when it starts to limp away. The figure in brackets is its health in quests with two or more of it.

Size

Small	Big	King
827.8	1048.6	1122.2

Small is the most a gold small crown can be. Big and King are the least for a silver and a gold crown.

Status ailments

	Effect	Tolerance	Buildup loss	Rise	Max
Poison	240 damage	100	10 every 5 s	50	300 (400)
Paralysis	10 s	100	5 every 10 s	65	360 (490)
Sleep	30 s	110	5 every 10 s	25	210 (260)
Stun	10 s	100	5 every 10 s	65	360 (490)

Tolerance is the buildup needed for the ailment. It goes up by the Rise figure each time, up to Max; Max in brackets is for G-Level. Poison effect is the total damage, the others are how long it lasts.

When enraged

Attack	Defense	Speed
+20%	No change	+30%

Attack is the extra damage it deals to hunters. Defense above zero means it takes less damage.

Hitzones

Part	Cut	Impact	Shot	Fire	Water	Thunder	Ice	Dragon	Stun
Head	50	80	100	10	30	30	40	0	100
Underneck	50	60	50	10	80	50	50	20	0
Belly	80	70	80	10	20	15	15	0	0
Back	40	50	40	10	20	15	15	0	0
Wings	75	70	70	10	10	25	15	0	0
Legs	25	30	30	5	5	5	5	0	0
Tail	50	60	30	10	20	15	15	0	0

Higher numbers take more damage. Stun is how much impact hits on that part add toward a stun.

Part durability

Head	80
Neck	100
Body	130
Left wing	100
Right wing	100
Left leg	100
Right leg	100
Tail	80

Breaks and tail cuts

Ears	Bring the head's durability to 0 twice.

Carves and rewards

Carves: Body 3.

Easy

Item	Body	Capture	Break	Drop
Kut-Ku Scale	25%	-	75% (Ears)	25%
Kut-Ku Scale ×3	-	-	25% (Ears)	-
Kut-Ku Shell	55%	36%	-	-
Flame Sac	-	10%	-	-
Screamer	-	24%	-	-
Sm Monster Bone	10%	-	-	-
Med Monster Bone	10%	30%	-	-
Wyvern Tears	-	-	-	75%

Low Rank

Item	Body	Capture	Break	Drop
Kut-Ku Scale	13%	-	-	16%
Kut-Ku Scale ×3	-	-	50% (Ears)	-
Kut-Ku Shell	50%	33%	-	-
Kut-Ku Ear	-	-	50% (Ears)	10%
Kut-Ku Webbing	32%	-	-	-
Flame Sac	-	20%	-	-
Giant Beak	5%	3%	-	-
Screamer ×2	-	24%	-	-
Med Monster Bone ×2	-	20%	-	-
Wyvern Tears	-	-	-	74%

High Rank

Item	Body	Capture	Break	Drop
Kut-Ku Carapace	25%	38%	-	-
Long Kut-Ku Ear	-	-	25% (Ears)	10%
Kut-Ku Scale+	50%	-	-	16%
Kut-Ku Scale+ ×3	-	-	25% (Ears)	-
Kut-Ku Ear	-	-	50% (Ears)	-
Kut-Ku Webbing	10%	-	-	-
Giant Beak	10%	5%	-	-
Monster Bone+	-	27%	-	-
Screamer ×2	-	17%	-	-
Inferno Sac	-	10%	-	-
Splendid Beak	5%	3%	-	-
Wyvern Tears	-	-	-	37%
Wyvern Sobs	-	-	-	37%

G-Level

Item	Body	Capture	Break	Drop
Str Kut-Ku Wing	32%	-	-	-
Thick Kut-Ku Scl	33%	-	-	16%
Thick Kut-Ku Scl ×3	-	-	25% (Ears)	-
Long Kut-Ku Ear	-	-	45% (Ears)	-
Hvy Kut-Ku Shell	25%	47%	-	-
Lucky Kut-Ku Ear	-	-	30% (Ears)	10%
Blazing Fire Sac	-	15%	-	-
Hvy Monster Bone	-	23%	-	-
Screamer ×4	-	10%	-	-
Splendid Beak	10%	5%	-	-
Wyvern Tears	-	-	-	25%
Wyvern Sobs	-	-	-	49%

Figures from モンスターハンターポータブル 2nd G 公式ガイドブック (Enterbrain, 2008), pages 212 and 213.

Quests it appears in

Slay the Great Kut-Ku!Pokke Village Attack of the Yian Kut-KuGathering Hall, Low Rank Trouble in the ForestGathering Hall, Low Rank Gathering - Jungle ZoneGathering Hall, High Rank Trapped by Yian Kut-KuGathering Hall, High Rank Fight for the ThroneGathering Hall, High Rank G-Lvl Gathering - Old JungleGathering Hall, G-Level Trapped by Yian Kut-KuGathering Hall, G-Level At Birds' Hill...Gathering Hall, G-Level Three WallsGathering Hall, G-Level Treasure in the Jungle!Treasure Hunters Jungle MenacePokke Village Slay the Great Kut-Ku!Pokke Village A Killing from MushroomsPokke Village Trapped by Yian Kut-KuPokke Village Epic Hunt in the Jungle!Pokke Village Kut-Ku Calamity!Pokke Village Bird Wyvern All-StarsPokke Village Yian Kut-Ku TrainingTraining School

Blue Yian Kut-Ku

A subspecies of Yian Kut-Ku marked by its blue shell. Its basic behavior is the same, but its abilities change more when enraged than an ordinary Yian Kut-Ku's, and its agility in particular rises a lot, so watch out for that.
Our translation of モンスターハンターポータブル 2nd G 公式ガイドブック (Enterbrain, 2008), page 214.

Blue Menace of the JungleGathering Hall, Low Rank Seeking the Strange MaskGathering Hall, Low Rank Trapped by Yian Kut-KuGathering Hall, High Rank Gathering - Forest and HillsGathering Hall, High Rank Twin Walls of the JungleGathering Hall, High Rank Trapped by Yian Kut-KuGathering Hall, G-Level Subspecies Three!Gathering Hall, G-Level G-Lvl Gathering - Frst&HillsGathering Hall, G-Level Attack of the Blue Kut-KuPokke Village Trapped by Yian Kut-KuPokke Village Seeking the Strange MaskPokke Village Kut-Ku Calamity!Pokke Village Blue Yian Kut-Ku ExercisesTraining School

Guide book figures for Blue Yian Kut-Ku