The Giraffatitan, often called Brachiosaurus

It turns out that the creature we’ve been calling “Brachiosaurus” — the one with the super-weird nostrils on top of its concave head — is not the same clade as every other one we’ve called Brachiosaurus for the last century. No, the one with the weird nostrils (not, as I was taught, for snorkeling as a submarine gargant, as it would have been unable to breathe with all that water pressure) is now called a Giraffatitan. Which is a pretty wonderful name.