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The largest birds, weighing 104 kg, can run at 70 km/h and lay the largest eggs.
Heavy birds from Australia and New Guinea, weighing around 45 kg, known for their vibrant wattles.
Australia's second-tallest birds at 190 cm, flightless with vestigial wings, weighing an average of 33 kg.
The heaviest penguins, weighing 31.5 kg, known for enduring extreme cold while breeding.
Flightless South American birds averaging 23 kg, a small population has established in Germany.
The largest flying bird, averaging 13.5 kg, they are agile fliers native to North America.