“The female of the species is more deadly than the male”, wrote Rudyard Kipling in the early 20th century, and indeed it was once proposed that female T. rex may have been larger and more terrifying than their opposite sex. However, more recent research has suggested that this probably wasn’t the case, and in fact it’s currently impossible to to identify the sex of most dinosaurs.

Mama-and-papasaurus

Even some apparent dead giveaways – such as dinosaur skeletons discovered on top of a clutch of fossilized eggs – are unlikely to be reliable indicators of sex. After all, in some modern birds like emus or cassowaries – which are essentially living dinosaurs – it’s the dads who look after the young, and it’s now thought that the enormous Spinosaurus may have been among the dinosa

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