Birds-eye

... Size has similar effect: small animals have fast metabolism and usually also die earlier. Then again, it has been reported that some species of birds (which have fast metabolism as warm-blooded animals) have developed a means to slow down aging and they live much longer than other animals of ...

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... example, black moths survived to reproduce which in turn shifted the population from mostly white to mostly black. With the finch example, those birds with smaller beaks survived to reproduce which in turn shifted the population to a ditribution of beak sizes which were smaller. Over many generations, ...

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... bristle hair number. This is a quanitative trait, determined by multiple genes. Another example which is from a natural situation is beak size in birds. In particular, Darwin's finches in the Galapagos islands. During a period of drought, small-seed plants began to dominate the flora and there ...

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... need to defend from anything. Aren't those spikes remnants of bird teeth that cacti possessed at some point of evolution - back when they were birds? Yes cactus are plants. They live in the desert, and there are quite a lot of plant eaters there, so yes they need defenses against grazing. Bird ...

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... need to defend from anything. Aren't those spikes remnants of bird teeth that cacti possessed at some point of evolution - back when they were birds?

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