000			01527nkc a22001937a 4500
005			20190129151933.0
008			190129b xxu||||| |||| 00| 0 eng d
024			_q841887034319
040			_cOC
050			_aQL75 .E88 2018
245			_aExtreme animal weapons [video recording] : _bnature's arms race / _cproduced and directed by Peter Fison.
260			_a[Place of publication not identified] : _bPBS Distribution, _cc2018.
300			_a1 videodisc : _bsound, color ; _c4 3/4 in.
306			_a(approximately 60 mins.)
520			_aFrom lobster claws and dog teeth to bee stings and snake fangs, every creature depends on weapon. But some are armed to extremes that make no practical sense-whether it's bull elks with giant 40-pound antler racks or tiny rhinoceros beetles with horns bigger than bigger than their body. What explains giant tusks, horns and claws that can slow an animal down and even impair health and nutrition? Showcasing astonishing wildlife cinematography, Extreme Animal Weapons investigates the riddle of outsize weaponry and uncovers a bold new theory about what triggers an animal arms race. In creatures as varied as dung beetles and saber-toothed tigers, shrimp and elephants, the same hidden factors trigger the race and, once started, these arm races unfold in exactly the same pattern. In this enthralling special, NOVA cracks the secret biological code that underlies nature's battleground.
650		0	_97060 _aAnimal weapons.
650		0	_97061 _aAnimal defenses.
942			_2lcc _cCDDVD
999			_c24927 _d24927