In two or three sentences, explain the overall idea of this passage. 

Birds of prey are known to display patterns of sexual dimorphism. It is commonly believed that the dimorphisms found in raptors occur due to sexual selection or environmental factors. 
In general, hypotheses in favor of ecological factors being the cause of sexual dimorphism in raptors are rejected. This is because the ecological model is less parsimonious, meaning that its explanation is more complex than that of the sexual selection model. Additionally, ecological models are much harder to test because a great deal of data is required. Dimorphisms can also be the product of intrasexual selection between males and females. It appears that both sexes of the species play a role in the sexual dimorphism within raptors; females tend to compete with other females to find good places to nest and attract males, and males compete with other males for adequate hunting grounds so they appear as the most healthy mate. It has also been proposed that sexual dimorphism is merely the product of disruptive selection, and is merely a stepping stone in the process of speciation, especially if the traits that define gender are independent across a species. 
In non-predatory birds, males are typically larger than females. However, in birds of prey, the opposite is the case.
system
do yaa teen vaakyon main, is maarg ke samgr vichaar ko samajhaayen.

shikaar ke pakshiyon ko yon dvirupata ke pattern ko pradarshit karne ke liye janaa jaataa he.yah aamtaur par mana jaataa he ki raptars main paae jane vaale demorphysm yon chayan yaa paryaavarniya karkon ke kaaran hote hai.
saamaanya taur par, paristhitik karkon ke paksh main pariklpana raptars main yon dvirupata kaa kaaran hone ke kaaran asweekaar kar di jaati he.iskaa kaaran yah he ki paristhitik model kam parshvikeey he, jiskaa arth he ki iskaa spashtikaran yon chayan model kii tulana main adhik jatil he.iske atirikt, paristhitik model pareekshan karne ke liye bahut kathin hai kyonki data kaa ek bada sauda aavashyak he.demorphysm bhi purushon or mahilaon ke bich intracexual chayan kaa utpaada ho saktaa he.aisa prathit hota he ki prajatiyon ke donon ling raptars ke bheetar yon dvirupata main bhoomika nibhaate hai;maadaaen anya mahilaon ke saath pratispardhaa karti hai taaki ghonsle or purushon ko aakarshith karne ke liye acchhee jagahen milin, or purush anya purushon ke saath paryaapt shikaar ke maidan ke liye pratispardhaa karte hai taaki ve sabase swasth saathi ke rup main dikhaai den.yah bhi prastaavit kiya gaya he ki yon dvirupata keval vighatnkaaree chayan kaa utpaada he, or atakalon kii prakriya main keval ek kadam he, khaskar agar ling ko paribhaashit karne vaale lakshan ek prajati main swatantra hai.
gaiyr-prachlit pakshiyon main, purush aamtaur par mahilaon se bade hote hai.haalanki, shikaar ke pakshiyon main, vipareet maamla he.
user
yah maarg is bare main baat karata he ki shikaar ke pakshi aam taur par yon dvirupata ke sanket kaise pradarshit karte hai jo tab hota he jab kisi prajati kaa ek ling duusare se bada yaa chota hota he.udhaaharan ke liye, purush ek mahila se bade hote hai.mana jaataa he ki demorfism yon chayan or paryaavarniya karkon kaa ek utpaada he.
assistant
<|system|>
</s>
<|user|>
do yaa teen vaakyon main, is maarg ke samgr vichaar ko samajhaayen.

shikaar ke pakshiyon ko yon dvirupata ke pattern ko pradarshit karne ke liye janaa jaataa he.yah aamtaur par mana jaataa he ki raptars main paae jane vaale demorphysm yon chayan yaa paryaavarniya karkon ke kaaran hote hai.
saamaanya taur par, paristhitik karkon ke paksh main pariklpana raptars main yon dvirupata kaa kaaran hone ke kaaran asweekaar kar di jaati he.iskaa kaaran yah he ki paristhitik model kam parshvikeey he, jiskaa arth he ki iskaa spashtikaran yon chayan model kii tulana main adhik jatil he.iske atirikt, paristhitik model pareekshan karne ke liye bahut kathin hai kyonki data kaa ek bada sauda aavashyak he.demorphysm bhi purushon or mahilaon ke bich intracexual chayan kaa utpaada ho saktaa he.aisa prathit hota he ki prajatiyon ke donon ling raptars ke bheetar yon dvirupata main bhoomika nibhaate hai;maadaaen anya mahilaon ke saath pratispardhaa karti hai taaki ghonsle or purushon ko aakarshith karne ke liye acchhee jagahen milin, or purush anya purushon ke saath paryaapt shikaar ke maidan ke liye pratispardhaa karte hai taaki ve sabase swasth saathi ke rup main dikhaai den.yah bhi prastaavit kiya gaya he ki yon dvirupata keval vighatnkaaree chayan kaa utpaada he, or atakalon kii prakriya main keval ek kadam he, khaskar agar ling ko paribhaashit karne vaale lakshan ek prajati main swatantra hai.
gaiyr-prachlit pakshiyon main, purush aamtaur par mahilaon se bade hote hai.haalanki, shikaar ke pakshiyon main, vipareet maamla he.</s>
<|assistant|>
yah maarg is bare main baat karata he ki shikaar ke pakshi aam taur par yon dvirupata ke sanket kaise pradarshit karte hai jo tab hota he jab kisi prajati kaa ek ling duusare se bada yaa chota hota he.udhaaharan ke liye, purush ek mahila se bade hote hai.mana jaataa he ki demorfism yon chayan or paryaavarniya karkon kaa ek utpaada he.</s>
