Arctic animals:  How do Arctic plants and animals survive?
Biodiversity:  Which has more biodiversity, rainforests or the ocean?
Biomagnetism:  What is biomagnetism?  Name some creatures that sense a magnetic field.
Brains: what animals have the heaviest brain?
Chews:  What animal chews its food with its legs?
Cold-blooded animals:  I had SARS on my mind when I saw a large snake crossing the road. This triggered a question. Do cold-blooded animals develop fevers if sick and how could you tell?
Eat:  What do most mammals eat? Do any eat blood other than the vampire bat?
Eat mates:  I was wondering are there any other female animals that eat their mate?
Eyes: What animal has the biggest eyes? How big are they?
Eyes:  Which land animal has the largest eyes? 
Fastest:  What is the fastest animal on Earth?
Hear:  Do any animals hear with ears on their legs?
Heart:  What animal has the biggest heart?
Heaviest: How much does the heaviest elephant weigh?
Highest jumper:  What animal can jump the highest?
Highest jumper:  I just read that a spittlebug jumps twice as high as a flea. Does that make it the highest jumper instead of the flea as you said in your column?
Life spans: which animals have the longest and which the shortest life spans?
Life spans: Regarding your answer for the longest-lived animal, I have a correction: the rougheye rockfish has been aged to 205 years.
Life spans:  Why do larger animals live longer than smaller ones?
Life spans revisited:  I read with interest your response as to "why larger animals live longer than small animals (slower metabolism and having a limited number of breaths and heartbeats). But we are all encouraged to exercise in order to live longer. Exercise uses up the breaths and heartbeats faster than someone at rest.  So, what's the deal?
Life spans: What insect has the longest life span?
Loudest animal:  What animal is the loudest?
Mass extinctions:  How often do mass extinctions and ice ages occur? Will humans eventually succumb to one?
Mass extinctions:  What caused the mass extinctions?
Mate for life:  Which animals mate for life?
Migrant champ: What animal migrates the farthest?
Migrant second champ: What animal migrates the next farthest?
Migrant champ land mammal: What land mammal migrates the farthest?
Mortality:  Is there an animal that lives more than 1000 years? If so, what is the animal?
Most poisonous: what's the most poisonous creature on earth?
Most poisonous, update:  What is the most poisonous creature in the world?  We may have found it:  a small beetle.  A reader alerts me to these new developments.
Neck bones:  In a recent question, you stated that almost all mammals have only seven neck bones. What about non-mammals? Do they have seven, too?
Next smartest: Next to humans, what animal is smartest?
No-father fertilization: Is it possible to take the chromosomes from one female egg and inject them into another female egg so they attach and actually form a fertilized egg?
Scent:  What is the speed of scent? If sharks can smell at great distances, how fast does the scent of blood or anything else travel in water or air? What permits scent to travel in water?
Smartest animals:  What are the top 10 smartest animals?
Smallest bird:  What is the world's smallest bird?
Survive without the Sun's energy:  How do creatures in the deep sea or deep rock survive with little or no energy from the Sun?
Tallest: What's the tallest animal? How tall?
Teeth:  Do other animals have separate sets of baby and adult teeth?
Teeth:  Why is it that animals don't have more dental problems even though they NEVER brush their teeth?
Water walk: How do insects walk on water?
Weight:  Which animal eats food equal to its weight?

Baby bird: When a human touches a bird's nest, does the mother bird really reject the young?
Baby names:  My son is doing a general knowledge test and we are struggling to find the answers for three questions: What are a young hare, a young falcon, and a young owl called?
Chicks:  What happens to the chicks when the adult birds migrate?
Chicks:  How fast do baby chickens grow (how much do they grow in a month)?
Chick twins:  Have two chickens ever hatched from one egg? You know, like twins.
Chicks:  In your recent article on tough eggs, you say the chick picks the more fragile middle "side" of the egg to peck its way out. This sounds like the hatchling has some choice in the matter – doesn’t it start pecking where its beak is?
Earthquakes:  Q: In school we learned that primary waves can travel through solids, liquids, and gases. My question is: what would happen if a P-wave was traveling through the ground and it reached a canyon and a bird was in the air when the wave started traveling through the air? Would the bird be affected?
Egg:  What side of an egg is stronger?
Egg, chicks breathe: Do baby chicks breathe inside the egg?
Egg, fertile: How can I check to see if the egg I found is fertile or not?
Egg, heaviest: What bird lays the heaviest egg?
Egg, leaky: What makes the little bubbles on boiling eggs?
Egg, pressure: at what average water pressure does a chicken egg fail?
Egg, smallest:  What's the smallest viable (one that hatches) egg?
Egg, smallest:  What’s the record for the smallest bird egg?
Geese:  Why do geese walk across a road when they can fly, thereby not getting hit by a car?
Harpy eagles: What is the life span of the harpy eagle?
Hummingbirds:  How the heck are hummingbirds tracked through their migrations?
Hummingbirds:  When hummingbirds fly south do they hitch rides on the backs of geese?
Jays:  You mention nutcrackers and jays, both of which are better hoarders than magpies (at least, for longer times). Why, then, do bright and shining things not also attract them?
Magpies:  Why do these birds have jewel-like objects on the brain?
Migrate: why do birds migrate south in the fall?
Migrant champ: What animal migrates the farthest?
Mobbing big birds:  How come big birds don't take a whack at little birds harassing them?  Do the big birds feel threatened or just annoyed?
Neck bones:  In a recent question, you stated that almost all mammals have only seven neck bones. What about non-mammals? Do they have seven, too?
Odors, distinguish: do they distinguish odors?
Ostrich and emus:  What is the difference between an ostrich and an emu?
Ostrich: How long does it take to boil an ostrich egg?
Ostrich:  Can ostriches swim?
Ostrich:  Do Ostrich have teeth to eat?
Owls:  What distance can an owl hear to?
Pigeons:  I heard that pigeons are rated number 3 on the list of the smartest birds. Is this true? What is a pigeons IQ? Where are they on the list of smart birds?
Rain: where do all the birds go when it rains?
Robin: how high do robins fly when they migrate?
Sleeping:  How can birds sleep without falling off their perches?
Sleeping:  Do birds close their eyes when they sleep?
Sleeping:  What bird flies while sleeping?
Sleeping:  Why do birds sleep on one foot?
Smallest bird:  What is the world's smallest bird?
Smallest bird:  What is the world’s smallest bird [and viable egg]?
Smell: do birds smell?
Swans:  Recently we were sitting outside and heard a bizarre noise coming from something flying over our heads. We realized it was a couple of swans, and we are now trying to figure out what the noise was.  Were they calling or was it their wings beating?
Tern, Arctic: How terns fly farther
Vision:  Do birds see both visible and ultraviolet light or only ultraviolet?

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