Dragon Cuckoo
This small reptile is draconic in form with powerful legs, long tail, and horned head. Unlike true dragons it lacks wings and front arms.

Dragon Cuckoo (CR 2; XP 600)
CE Small dragon
Init +5; Senses darkvision 60 ft., low-light vision; Perception +6
AC 14, touch 12, flat-footed 12
(+1 Dex, +2 natural, +1 size)
hp 25 (3d12+6)
Fort +5, Ref +4, Will +3
Immune paralysis, sleep
Speed 30 ft.
Melee bite +6 (1d6+2 plus grab), 2 claws +6 (1d4+1)
Special Attacks chew, exploding attack
Str 14, Dex 12, Con 15, Int 3, Wis 10, Cha 10
Base Atk +3; CMB +4 (+8 grapple), CMD 15
Feats Improved Initiative, Skill Focus (Stealth)
Skills Acrobatics +4 (+10 to jump), Perception +6, Stealth +14; Racial Modifiers +6 Acrobatics to jump
SQ cocoon
Environment underground
Organization solitary or clutch (2-4)
Treasure none
Special Abilities
Chew (Ex) Dragon cuckoos are little dragons with big mouths. On a bite attack, they can attempt to grapple as a free action any creature of size Large or smaller. This often leaves the cuckoo hanging onto their foes by their teeth.
Cocoon (Ex) Dragon cuckoos can create a false eggshell cocoon around themselves. A Perception check (DC 15) reveals that the egg is not a true one.
Exploding Attack (Ex) Dragon cuckoos hide in their shell-like cocoon waiting for potential meals. If they are able to surprise foes they can explode out of their shells with a +4 circumstance bonus on their first attack. They leap to bite taller prey in the face.

These ghastly creatures resemble a dragon hatchling, if half the mass of a hatchling was its jaws and teeth. Dragon cuckoos have thick, knotted muscles in their legs, adapted for quick, brutal jumps. Like wyverns, they lack forearms. The breathing of the cuckoo is shallow and desperate, as their small lungs struggle to support their activity.

Despite their name, these creatures are valued by true dragons—in fact, they were created by true dragons. Dragon cuckoos are the last line of defense for a nest of dragon eggs. They weave leathery cocoons around themselves, which appear identical to an egg. Inside its cocoon, the cuckoo hibernates for months on end, waiting for something unfamiliar to disturb its false egg. When an intruder comes near it explodes outward, its massive jaws maiming and tearing away chunks of flesh until the nest is safe again.

When the true dragons hatch, the cuckoo slinks away into the depths of the lair to lay its own sickly clutch of eggs to safeguard the next generation of true dragons.

On Porphyra
Dragon cuckoos are used extensively by the dragons that lair within Purple Mountain. They guard the lairs of dragons long after their original habitants have been slain.