Please briefly sum up what this article says about orcas' bodies. 

Orcas are known for their long dorsal fin (the fin on the animal's back) and black-and-white coloring. The black-and-white coloring helps to camouflage them by obscuring their outline in the water. Just behind the dorsal fin is a patch of gray called a "saddle" — because it looks like a riding saddle. 

An orca's body is cylindrical and tapers at each end to form a hydrodynamic shape. This shape, along with the orca's large size and strength, makes it among the fastest marine mammals, able to reach speeds in excess of 30 knots (about 34 mph, or 56 km/h). Orcas have massive teeth, which can grow up to 4 inches (10 centimeters) long, according to National Geographic.
system
kripaya sankshep main is lekh ko orkas ke nikaayon ke bare main kya kehete hai.

orkas ko unke lambey prishthiya pankh (jaanavar kii peeth par pankh) or kaale or safed rang ke liye janaa jaataa he.kaale or safed rang main pani main unki ruparekha ko aspasht karke unhen chalaavaran karne main madad milti he.prishthiya pankh ke thik peeche grey kaa ek ptch he jise "lathi" kaha jaataa he - kyonki yah ek sawari lathi kii tarah dikhataa he.

ek orka kaa sharir belanaakaar he or prayek chor par ek hydrodynamik aakaar banane ke liye taper he.yah aakaar, orka ke bade aakaar or shakti ke saath, ise sabase tej samudri stanadhariyon ke bich banaata he, jo 30 samudri mile (lagbhag 34 mile prati ghante, yaa 56 kimi/ghanta) se adhik kii gati tak pahunchane main sakasham he.neshnal jeeographic ke anusaar, orkas main bade paimaane par daant hote hai, jo 4 inch (10 centimetre) lambey ho sakate hai.
user
orkas ke daant 4 inch lambey, lambey prishthiya pankh, kaale or safed chalaavaran rang, or unke belanaakaar, hydrodynamik ke aakaar ke sharir par grey lathi ke daant hai.ve sabase tej samudri stanadhariyon main se hai, jo 30 samudri mile (34 mile prati ghante yaa 56 kimi/ghanta) tak pahunchate hai.
assistant
<|system|>
</s>
<|user|>
kripaya sankshep main is lekh ko orkas ke nikaayon ke bare main kya kehete hai.

orkas ko unke lambey prishthiya pankh (jaanavar kii peeth par pankh) or kaale or safed rang ke liye janaa jaataa he.kaale or safed rang main pani main unki ruparekha ko aspasht karke unhen chalaavaran karne main madad milti he.prishthiya pankh ke thik peeche grey kaa ek ptch he jise "lathi" kaha jaataa he - kyonki yah ek sawari lathi kii tarah dikhataa he.

ek orka kaa sharir belanaakaar he or prayek chor par ek hydrodynamik aakaar banane ke liye taper he.yah aakaar, orka ke bade aakaar or shakti ke saath, ise sabase tej samudri stanadhariyon ke bich banaata he, jo 30 samudri mile (lagbhag 34 mile prati ghante, yaa 56 kimi/ghanta) se adhik kii gati tak pahunchane main sakasham he.neshnal jeeographic ke anusaar, orkas main bade paimaane par daant hote hai, jo 4 inch (10 centimetre) lambey ho sakate hai.</s>
<|assistant|>
orkas ke daant 4 inch lambey, lambey prishthiya pankh, kaale or safed chalaavaran rang, or unke belanaakaar, hydrodynamik ke aakaar ke sharir par grey lathi ke daant hai.ve sabase tej samudri stanadhariyon main se hai, jo 30 samudri mile (34 mile prati ghante yaa 56 kimi/ghanta) tak pahunchate hai.</s>
