Cuckoo

The Cuckoo is a limited legendary pet from the Hungry Birds Event, hatched from the Bird Egg or the Premium Bird Egg with a generous 30% obtainment chance. That 30% is unusually friendly for a legendary — most legendaries hide behind single-digit odds, so a Cuckoo is realistically reachable within a reasonable run of eggs, especially if you funnel into the Premium Bird Egg for better overall pulls.

The catch is the limited tag. The favorable hatch rate only existed while the Hungry Birds Event was live; once it ended, the Bird Egg pipeline closed and the Cuckoo became a fixed, finite supply. That combination — once easy to obtain, now permanently capped — is exactly what drives steady trade demand for retired bird pets.

For team-building, a legendary bird passive is strong enough to deserve a slot on most active rosters, slotting in alongside your growth and sell-multiplier pets. If you were around for the Hungry Birds Event, that 30% rate made the Cuckoo one of the easier legendaries to bank, so there is little excuse not to have one. Players who missed the window should weigh it as a solid mid-tier trade target rather than a desperate chase.