It kinda depends. They can best be described as 'uncomfortable' to handle one - but they're designed to hurt anything that tries to eat it.
Iguana
it sounds like a male common lizzard!
Well its quit simple considering Spinosaurus means "Spined lizard" a.k.a the sail coming out of its back. its sail is made from huge pillers or spines jutting out of its back with skin ataching its spines together to form a sail. Kinda obvious...no offence... hope it helped :)
Iguana
Spinosaurus means "spine lizard," referring to the long spines it has on its backbones. The spines were the support structures of the sail on its back. The purpose of the sail is unknown, but it may have been for display of for thermoregulation.
They are radially symmetrical, there is no cephalization ( no heads ) and they are, like you deuterostomes. ( indeterminate cleavage and a mouth that does not arise from the blasophore ). Also, they are all marine animals and they have spiny skin.
Yes, I saw a lizard with a completely blue iridescent back.
Because they have spines (a back bone).
16000
What ya got there is a spiny-back spider. See Related Links for some pics.
Kill the ants in your back yard.
Porcupines are rodents with spines (or quills as the are also known).