The largest birds, weighing 104 kg, can run at 70 km/h and lay the largest eggs. Australia's second-tallest birds at 190 cm, flightless with vestigial wings, weighing an average of 33 kg.
Birds are an incredibly diverse group of animals that have conquered almost every habitat on Earth. One thing every avian has in common is their origin in the egg. Although the shell’s size, shape, ...