early birds beat the rush

As global warming brings an earlier start to spring, the early bird might not just get the worm.

It might also get its genes passed on to the next generation. Because plants bloom earlier in the year, animals that wait until their usual time to migrate might miss out on all the food.

Those who can reset their internal clocks and set out earlier stand a better chance at having offspring that survive and thus pass on their genetic information, thereby ultimately changing the genetic profile of their entire population.

Livescience, 16 Aug 2011