He notes that an animal's structure is well matched to function so birds like the heron (which live in marshes with soft mud and live by catching fish) have a long neck, long legs, and a sharp spear-like beak, whereas ducks that swim have short legs and webbed feet.
hiː nˈoʊts ðæt ɐn ˈænɪməlz stɹˈʌktʃɚɹ ɪz wˈɛl mˈætʃt tə fˈʌŋkʃən sˌoʊ bˈɜːdz lˈaɪk ðə hˈɛɹən wˌɪtʃ lˈɪv ɪn mˈɑːɹʃᵻz wɪð sˈɔft mˈʌd ænd lˈaɪv baɪ kˈætʃɪŋ fˈɪʃ hæv ɐ lˈɔŋ nˈɛk, lˈɔŋ lˈɛɡz, ænd ɐ ʃˈɑːɹp spˈɪɹlˈaɪk bˈiːk, wˈɛɹæz dˈʌks ðæt swˈɪm hæv ʃˈɔːɹt lˈɛɡz ænd wˈɛbd fˈiːt.