Meanings of have spiny in English

Tuataras have spiny crests along their backs made from soft, triangular folds of skin.

Does it have spiny spores?

Others, like the thorn rat, have spiny bodies difficult to chew, making it challenging to get to the good, soft meat within.

Her characters reflect that contradiction: For all their people-pleasing girlishness, they have spiny ambitions, dreams at once mocked and validated by the show.

They were green and blue and red, and they had spiny rays like starfish on which they danced.

The dead specimen, two meters long, had spiny ridges and overlapping green armor plates, as well as curved teeth to hook prey.