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How to read a phylogenetic tree

• Each bubble represents a cetacean species.
• Hover and click on a species to learn more about them!
• A node between two species represents a genetic divergence between them.
• The longer the line between two species, the more genetically different they are.
• Find the red node: this is the Crown Cetacea, the oldest common ancestor of all cetaceans.
• Biologically similar species may belong to the same Genus (small group of species) or to the same Family (bigger group of species).
• Images with the same color outline belong to the same family.
• QUIZZ! Find the name of the biggest and the smallest(s) families of this tree!