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my guess is coz some birds can tolerate cold weather while others can't
Most mammals rely on trees for living space and food. Insects use them for camoflauge. While birds use them to keep their nests from harm.
That is a matter of opinion. Some people prefer colder climates while others prefer warmer ones. Or some prefer to live ocean side while others inland. There is no such thing as the best place to live, anywhere.
Some large birds are herbivores while others are not. Some large birds like flamingos dine on a diet of shrimp.
Birds beaks are designed for what they eat and where they live.
Some say Hershey's, while others say it's Ghirardelli's. Yet others prefer Cadbury's. Personally, I prefer semi-sweet. Your opinion may vary.
The beak and the tallons.
Some prefer pine or fir, while others prefer oak or walnut. It depends entirely on your point of view.
Male birds often have bright colors, while the females look more camouflaged to keep them safe.
Many people who work 5 weekdays prefer Saturday because they can sleep in and stay out all night long. While others prefer Sunday, as it is a day focused on rest and family.
It depends. Some will actually go after whales, while others prefer seals.
That would depend on your cultural and recreational preferences, and the proximity to your workplace. Some consider the Northwest quadrant of Calgary to be the best, while others prefer the Southeast, and others prefer to live in the Core ( downtown).