Animal life and intelligence . m ffl £ 3 tw a O ,. m ,- g r- s CCiH nd f3 P - si fc Tl ^ (1) -fl © pq £ CD -= -rH d >vi-i ;— _jj - X! 0) rd ? X 00 CD T3 OS § a _ o c *. Organic Evolution. 181 called trigger. These two are so hinged to the underlyinginterspinous bones and so related to each other that, whenonce the defensive spine in front is erected, it cannot beforced down until the trigger is lowered. The secondexample of special adaptation is well displayed in specimensof the mud-tortoise Trionyx. Between the last vertebraof the neck and the first fixed vertebra of the dorsal seriesis a
Animal life and intelligence . m ffl £ 3 tw a O ,. m ,- g r- s CCiH nd f3 P - si fc Tl ^ (1) -fl © pq £ CD -= -rH d >vi-i ;— _jj - X! 0) rd ? X 00 CD T3 OS § a _ o c *. Organic Evolution. 181 called trigger. These two are so hinged to the underlyinginterspinous bones and so related to each other that, whenonce the defensive spine in front is erected, it cannot beforced down until the trigger is lowered. The secondexample of special adaptation is well displayed in specimensof the mud-tortoise Trionyx. Between the last vertebraof the neck and the first fixed vertebra of the dorsal seriesis a beautiful hinge-joint, enabling the neck to be bentback, S-fashion, when the creature withdraws its headwithin the carapace. These are only one or two particularinstances of what any one who will visit the NationalMuseum may see for himself admirably displayed andillustrated. No one can, one would suppose, pass through thegalleries in Cromwell Eoad and remain quite insensible tothe beauties of animal life. Beauty of form and beauty ofcolour are conspicuously combined in many species of birdsand insects. And much of this colour-beauty and splendidiridescence is know
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Keywords: ., booksubjectanimalintelligence, booksubjectpsychologycomparative
