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Actually, Japut3h, the iceages were not as bad as that.
Around the equators, temperatures were still hot. What actually killed the dinasaurs was a metor impact that killed 75% of all life on this planet. It left them with too little to live off so they also joind the metor casualties.
Also dinasaurs were warmblooded and some were big enough that they could easilly live and survive in sub zero temperaturs if there was enough to eat. However, there was not enough to eat after the metor impact so all large species became extinct. They have not been able to re-evolve due to the fact that mamals have been in direct competition ith reptiles, thus there can no longer be any large animals supported (elephant being the largest land one).
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