Chronogram of penguin diversification. Nodes A and B indicate 104 and 90 myr. Credibility intervals (95%) are indicated by grey bars at numbered internal nodes. Vertical dashed line indicates the K/T boundary. Periods when Antarctica was ice-covered (black continuous bars) are indicated by shaded grey rectangles. Ocean temperature is based on high-resolution deep-sea oxygen isotope records. The MMCT is indicated by an arrow.
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