The chapter about convergent evolution is super interesting. I knew of the example of flight for instance: flight and wings have evolved at different points in different species but with analogous structures and mechanism.
One example I wasn't aware of is echolocation on a molecular genetics level. Some species of bats and some species of dolphins both use echolocation for "seeing" in space. There is a gene that codifies the prestin protein in mammals and it has undergone similar amino acids substitutions in both dolphins and bats independently, driven by natural selection, so that they can hear high frequency sounds for echolocation, so cool!
One example I wasn't aware of is echolocation on a molecular genetics level. Some species of bats and some species of dolphins both use echolocation for "seeing" in space. There is a gene that codifies the prestin protein in mammals and it has undergone similar amino acids substitutions in both dolphins and bats independently, driven by natural selection, so that they can hear high frequency sounds for echolocation, so cool!