Always depicted as a large rooster has the ability to fly spit poison venoms sometimes breath fire and has a petrifying gaze
Note: The Cockatrice is much larger than the Basilisk in the Basilisk’s rooster formation!
IT really all comes down to which type of Basilisk there are many at leat 5 or 6 different types it’s formations unlike the Cockatrice have evolved over the years!
1.Cockerel-head of a rooster tale of a snake able to fly spits poisonous venom and can petrify with its gaze smaller than its cousin the Cockatrice who is larger in size!
2.Lizard- Four or more legs spits poisonous venom and can petrify with its gaze sometimes able to breath fire
Note: size may differ
3.Dragon- these are able to take flight spits poisonous venom and can petrify with its gaze!
4.Serpent-A very large snake much larger than the Cockatrice in both length height and width spits poisonous venom and can kill instantly with its gaze with direct eye contact but only petrifies with indirect contact)
Note1:There is also a small winged type but is only the size of a normal snake I imagine it has the same abilities to spit poisonous venom and has a petrifing gaze!
Note2: The vision of the Basilisk is not the only thing to grow in lethality however as it’s venom eventually came to possess such potency that it is able to kill by proxy simply touching something which it had come into contact with the venom can prove leathal thus traveling along a weapon poisoning the victim with indirect contact with the Serpent!
Another main difference is the way it is born!
The basilisk is hatched by a cockerel from the egg of a serpent or
The cockatrice is hatched from a cockerel's "egg" incubated by a
serpent or toad.