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ZAHAVI'S THEORY or
ZAHAVI'S HANDICAP [👍], Why 🗣️are…
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Why 🗣️are expensive???
1.. require energy for producing signals 
Principles : 🗣️🗣️🗣️
1 ..... Animals communicate through signals
2.... These signals in order to be effective must be honest .
3... Honest signals are expensive.
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Charles Darwin could not explained among such as was : the tail of peacock. 🦚
Ronald Fischer :
" Run away sexual selection hypothesis"🧐
Mid of 1970 's
Husband and wife
ZAHAVI amotz .... Put forward the novel idea and give the principle " ZAHAVI'S handicap principle"
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Statement 📄📑
" Reason for developing such characters could indeed have started with a slight female preference when the tail first appear. 🦚"
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Females which selected males with the most developed characters can be sure they have selected from among the best genotype of male population. Amotz ( 1975)
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The 🦚 hold his tail upright in its self a process that would seems to need strength and shakes it vigorously