Yian Kut-Ku
Japanese name: イャンクック (Monster Hunter Portable 2nd G official guidebook, Enterbrain, 2008, p. 212).

A bird-like 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.
From the guide book
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 the Monster Hunter Portable 2nd G official guidebook (Enterbrain, 2008), p. 212.
Hitzones
Damage the part takes, in percent. The higher the number, the weaker the spot.
| Part | Cut | Impact | Shot | Fire | Water | Thunder | Ice | Dragon |
|---|---|---|---|---|---|---|---|---|
| Head | 50 | 80 | 100 | 10 | 30 | 30 | 40 | 0 |
| Neck | 50 | 60 | 50 | 10 | 80 | 50 | 50 | 20 |
| Back | 40 | 50 | 40 | 10 | 20 | 15 | 15 | 0 |
| Belly | 80 | 70 | 80 | 10 | 20 | 15 | 15 | 0 |
| Tail | 50 | 60 | 30 | 10 | 20 | 15 | 15 | 0 |
| Wings | 75 | 70 | 70 | 10 | 10 | 25 | 15 | 0 |
| Legs | 25 | 30 | 30 | 5 | 5 | 5 | 5 | 0 |
Health
The game's own monster table gives a base health of 1,600. The guidebook's figures for each rank follow.
Capture and limp are the share of health left.
| Quests | Base health | Capture at | Limps at |
|---|---|---|---|
| Village, low rank | 820 | 30% | 20% |
| Gathering Hall, low rank | 1,720 | 30% | 20% |
| Gathering Hall, high rank | 2,080 | 18% | 12% |
From the Monster Hunter Portable 2nd G official guidebook (Enterbrain, 2008), p. 212. Freedom 2 has no G rank, so those rows are left out.
Status tolerance
Build-up needed before the status takes hold. Each time it does, the next one needs more, up to the cap. Build-up drains over time.
Figures from the game's own monster table. Where the Monster Hunter Portable 2nd G official guidebook (Enterbrain, 2008, p. 212) prints a different one, the book's figure is in brackets.
| Status | Effect | First at | Then + | Cap | Drains |
|---|---|---|---|---|---|
| Poison | 240 damage | 100 | 50 | 300 | 10 per 5 s |
| Paralysis | 10 s | 100 | 65 | 360 | 5 per 10 s |
| Sleep | 30 s | 110 | 25 | 210 | 5 per 10 s |
| Stun | 10 s | 100 | 65 | 360 | 5 per 10 s |
Part durability
Damage a part takes before it flinches or breaks.
| Part | Damage |
|---|---|
| Head | 80 |
| Neck | 100 |
| Body | 130 |
| Left wing | 100 |
| Right wing | 100 |
| Left leg | 100 |
| Right leg | 100 |
| Tail | 80 |
From the Monster Hunter Portable 2nd G official guidebook (Enterbrain, 2008), p. 212. Freedom 2 has no G rank, so those rows are left out.
Carves and drops
Chances are the game's own, out of 100 for each carve or drop. Easy is a third table the game keeps beside low and high rank; it matches the 2nd G guidebook's 簡単 column. Treasure Hunts use their own lists.
Body carve
| Item | Easy | Low rank | High rank | Treasure Hunts |
|---|---|---|---|---|
| Kut-Ku Shell | 55% | 50% | ||
| Kut-Ku Scale | 25% | 13% | ||
| Sm Monster Bone | 10% | |||
| Med Monster Bone | 10% | |||
| Kut-Ku Webbing | 32% | 10% | ||
| Giant Beak | 5% | 10% | ||
| Kut-Ku Carapace | 25% | |||
| Kut-Ku Scale+ | 50% | |||
| Splendid Beak | 5% | |||
| Kut-Ku Gizzards | 50% | |||
| Kut-Ku Cartilage | 35% | |||
| Kut-Ku Skin | 13% | |||
| Kut-Ku Jewel | 2% |
Dropped item
| Item | Easy | Low rank | High rank | Treasure Hunts |
|---|---|---|---|---|
| Wyvern Tears | 75% | 74% | 37% | |
| Kut-Ku Scale | 25% | 16% | ||
| Kut-Ku Ear | 10% | |||
| Wyvern Sobs | 37% | |||
| Kut-Ku Scale+ | 16% | |||
| Long Kut-Ku Ear | 10% | |||
| Hard Dragonrock | 90% | |||
| Kut-Ku Jewel | 10% |
Each capture list is one draw out of 100; each break part has its own list out of 100.
Capture reward
| Item | Easy | Low rank | High rank |
|---|---|---|---|
| Kut-Ku Shell x1 | 36% | 33% | |
| Screamer x1 | 24% | ||
| Med Monster Bone x1 | 30% | ||
| Flame Sac x1 | 10% | 20% | |
| Screamer x2 | 24% | 17% | |
| Med Monster Bone x2 | 20% | ||
| Giant Beak x1 | 3% | ||
| Kut-Ku Carapace x1 | 43% | ||
| Monster Bone+ x1 | 27% | ||
| Splendid Beak x1 | 3% | ||
| Inferno Sac x1 | 10% |
Part break reward
| Part | Item | Easy | Low rank | High rank | Treasure Hunts |
|---|---|---|---|---|---|
| Ears | Kut-Ku Scale x1 | 75% | 70% | ||
| Ears | Kut-Ku Scale x3 | 25% | 50% | ||
| Ears | Kut-Ku Ear x1 | 50% | 50% | 30% | |
| Ears | Long Kut-Ku Ear x1 | 25% | |||
| Ears | Kut-Ku Scale+ x3 | 25% |
From Freedom 2's own data, checked against the Monster Hunter Portable 2nd G official guidebook (Enterbrain, 2008), p. 213. Easy and low rank match the book; the high rank lists are Freedom 2's, which 2nd G changed.
Quests it appears in
Blue Yian Kut-Ku
Japanese name: イャンクック亜種 (Monster Hunter Portable 2nd G official guidebook, Enterbrain, 2008, p. 214).

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 the Monster Hunter Portable 2nd G official guidebook (Enterbrain, 2008), p. 214.
Body carve
| Item | Low rank | High rank |
|---|---|---|
| Kut-Ku Webbing | 15% | 10% |
| Blue Kut-Ku Shl | 35% | |
| Blue Kut-Ku Scl | 45% | |
| Giant Beak | 5% | 10% |
| Blue Kut-Ku Cpc | 25% | |
| Blue Kut-Ku Scl+ | 50% | |
| Splendid Beak | 5% |
Dropped item
| Item | Low rank | High rank |
|---|---|---|
| Wyvern Tears | 74% | 37% |
| Blue Kut-Ku Scl | 16% | |
| Kut-Ku Ear | 10% | |
| Wyvern Sobs | 37% | |
| Blue Kut-Ku Scl+ | 16% | |
| Long Kut-Ku Ear | 10% |
Capture reward
| Item | Low rank | High rank |
|---|---|---|
| Blue Kut-Ku Shl x1 | 36% | |
| Screamer x2 | 24% | 17% |
| Med Monster Bone x2 | 27% | |
| Giant Beak x1 | 3% | |
| Flame Sac x1 | 10% | |
| Blue Kut-Ku Cpc x1 | 43% | |
| Monster Bone+ x1 | 27% | |
| Splendid Beak x1 | 3% | |
| Inferno Sac x1 | 10% |
Part break reward
| Part | Item | Low rank | High rank |
|---|---|---|---|
| Ears | Kut-Ku Ear x1 | 50% | 50% |
| Ears | Blue Kut-Ku Scl x3 | 50% | |
| Ears | Long Kut-Ku Ear x1 | 25% | |
| Ears | Blue Kut-Ku Scl+ x3 | 25% |
From Freedom 2's own data, checked against the Monster Hunter Portable 2nd G official guidebook (Enterbrain, 2008), p. 215. Easy and low rank match the book; the high rank lists are Freedom 2's, which 2nd G changed.