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For egg-laying animals, it's almost always in the late spring or summer.
對卵生動物來說，一般都會在晚春或是夏季進行繁殖。
That way, the eggs can be incubating during the summer, during the warmest part of the year,
那樣的話，蛋就能在夏季里孵化，也就是一年中最溫暖的季節，
when the climate is the most amenable to the production of young.
那時氣候宜人，是最適合哺育幼崽的季節。
To know when to mate, dinosaurs react to the change of seasons.
為得知何時將會交配，恐龍會對季節的變化做出反應。
In the weeks leading up to the breeding season,
在繁殖季節的前幾周內，
there would be hormonal changes taking place in the body of the dinosaur that are triggered by passing time itself...
恐龍體內的荷爾蒙會發生一定的變化，并且是隨著時間變化而變化的，
by the length of the day, for example.
比如說，由白晝的長短來決定。
As winter recedes, the days get longer.
隨著冬天的逝去，白天會變得更長。
Sensors in the back of the eyes respond to changing light, transmitting crucial information to the brain.
位于眼睛后方的感光器官會對光線的變化做出反應，并把重要訊息傳遞給大腦。
A signal triggers the pituitary gland to release the hormone gonadotropin.
這個信號會促使腦垂體釋放出促性腺激素。
These chemicals prepare their bodies to produce eggs or sperm.
這些化學物質會讓身體準備好產生卵子或精子。
Raging hormones also trigger dramatic changes in behavior, and very different changes in males and females.
激增的荷爾蒙也會使它們的行為發生巨大的變化，而且雄性和雌性的變化大相徑庭。
For the females, that means stockpiling resources to produce the offspring.
對雌性來說，它們會囤積營養為產卵最好準備。
For the males, that means figuring out how they're gonna beat the other males at the game of reproduction itself.
而雄性，則會一直思考著如何才能在這場繁殖大戰中打敗其他的雄性競爭者。
They're more alert. They're more visual. They're being more aggressive.
它們會更警覺。眼神會更好，也更具侵略性。
There are more fights, beginning a whole cascade of social complexity which would be really fun to watch.
那時會有更多的戰斗，并會創建一連串復雜的社會關系，那看上去將會很有趣。
With hormones racing through their veins, a carnivore's advanced killing tools become even more deadly.
隨著荷爾蒙在血液里的激增，食肉動物先進的殺戮武器會變得更加致命。
Between the ages of 15 and 18, the mortality rate for meat eaters like T. Rex increases five-times.
在十五至十八歲之間，像雷克斯霸王龍這樣的食肉動物，其死亡率較平時會增加五倍。
This is the age adolescent males begin to challenge older, more experienced males.
在這個年齡段里年少的雄性恐龍會開始挑戰更年長，更富經驗的雄性恐龍。
Battles may start over a mate, but they can quickly develop into a death match.
開始可能只是為了爭奪配偶而戰，但很快這將會演變成一場生死之戰。
There's going to be some threshold, some test that the male has to pass to get the privilege of mating with the female, get the privilege of reproducing.
雄性恐龍必須要通過一些門檻和測試后才能獲得與雌性交配的特權，和繁殖后代的特權。
Fights break out over territory, bravado, and, of course, to impress females.
戰斗通常因領地而起，有時也是虛張聲勢，當然也為了博得雌性的好感。
These clashes are shows of strength meant to prove who has the best genes.
這些沖突都是力量的展現，意在證明誰的基因才是最優秀的。
Fortunately, most of the time, the aim is not to kill your opponent.
幸運的是，在大部分情況下它們都不想置對手于死地。
