A very good and interesting question !!!
I guess evolution?
Or simply because god thought we should have some varity?
Because your glasses are upside down.What would you see if they where inside out?
Without substitutes.Are we strong enough to drink coffee without substitutes or are we weak and fragile?
The people addicted to sugar needs sweetness but are people who doesnt need sugar sweet enough allready?
Because its nailed by to many knockers.
Do threy place the mycis in the old-cheese in different places or do they just put them somewhere coninsedently?
Beause you are awake.
Why is it four in the morning in your place when it is 14.10 here?
I am earthling calling mars to wish good day

How many snowballs can you get in an own?
oh dear...side by side

Well yes in a way.Would you like your vegetable-steak well done?
by its cold personality.
How can you recognise a cold personality through few words?
because the answer cant allow me to answer that.
Why did the hunters remove those horns from the poor animals to make money on it?
the answers are in the air.
What is the air?
Because they started to do so long before the invention of a "south" and a "winter"... The alternative answer is that it takes to long time to walk + there's water in the way... So regardless of these recent "explanations", why do (some)birds move long distances twice a year? Do they have a concept of time? Are they smarter than they seem? Are the species of birds the true crown of creation? And us humans just a pathetic cul de sac in evolution?
the birds are said to have an inner compass due to a theory of nature.
The compass is set by the sun.
If the compass-system gets disturbed fks.: by changes in climate due to inviremental changes the birds may have their trip distroid which can have serious consequenses for them.(...)
Imy personal answer to your question is yes I think they are smarter then they seem.
A Person can be pathetic but can also be non-pathetic.
If we are so clever,why do we invent stuff that may kill the whole life around us?