Sparkling · Durbanville · South Africa
Pieter Ferreira Birdsong Extra Brut
Scored from 13 calibrated Vivino reviewers, each re-centered on their own rating baseline before the bottle is ranked. Cohort: Sparkling · South Africa (111 wines).
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Tasting profile
A crisp, dry South African MCC with fine bubbles and a yeasty, brioche-led nose layered with green apple, pear, quince and citrus. Light and fresh on the palate with toasty, creamy texture and a long dry finish.
Synthesized from 13Vivino reviewers' tasting notes for this bottle.
What reviewers say
“Bottled 2021. Fabulous MCC with strong brioche and biscuit nose, with brioche, stewed apple and pear flavours. Very dry long finish. A must try!”
From a top-rated Vivino review for this bottle.
Summary
Pieter Ferreira Birdsong Extra Brut is a South African sparkling wine from Durbanville.
Its in-cohort standing is measured against 110 other sparkling wines from South Africa, not against the corpus as a whole. Only 13 of its Vivino reviewers rate with enough spread for a personal baseline to be measured, so the calibrated figure rests on a thin sample; a broader pool of 13 reviewers with at least two ratings feeds the raw-average track.
How the score was built
We compare the reviewers of this bottle against every other wine those same people reviewed. Each review is scored relative to the reviewer's own baseline — four stars from someone who hands out fives means something very different from four stars from someone who rarely goes above three. Every reviewer then counts the same, so the result is a calibrated consensus rather than a star average.
- Global percentile
- Where Pieter Ferreira Birdsong Extra Brut lands against every wine we rank.
- In-cohort percentile
- The same comparison narrowed to its cohort — wines of the same type from the same country. A Chilean red is judged against Chilean reds, not against Champagne. Ranked against Sparkling · South Africa (111 wines).
- AI-adjusted percentile
- The same reviewer-normalized score, corrected for how much confidence the sample supports: thin samples are pulled toward the corpus average. Each wine keeps the share n / (n + 53) of its measured distance from the average, where n is its calibrated-reviewer count, and the result is ranked on the same scale as the global percentile.53 is the median sample size across everything we rank. Here n is 13.
Cohort: Sparkling · South Africa
