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Possible Answers:
Mammals.
Last seen on: Daily Celebrity Crossword – 1/18/19 Sports Fan Friday
Random information on the term “Warm-blooded animals”:
An ectotherm (from the Greek ἐκτός (ektós) “outside” and θερμός (thermós) “hot”), is an organism in which internal physiological sources of heat are of relatively small or quite negligible importance in controlling body temperature.[1] Such organisms (for example frogs) rely on environmental heat sources,[2] which permit them to operate at very economical metabolic rates.[3] Some of these animals live in environments where temperatures are practically constant, as is typical of regions of the abyssal ocean and hence can be regarded as homeothermic ectotherms. In contrast, in places where temperature varies so widely as to limit the physiological activities of other kinds of ectotherms, many species habitually seek out external sources of heat or shelter from heat; for example, many reptiles regulate their body temperature by basking in the sun, or seeking shade when necessary in addition to a whole host of other behavioral thermoregulation mechanisms.For home captivity as pet, reptile owners can use a UVB/UVA light system to assist the animals’ basking behaviour.[4]
Warm-blooded animals on Wikipedia
Random information on the term “Mammals”:
In a zoological context, spines are hard, needle-like anatomical structures found in both vertebrate and invertebrate species.The spines of most spiny mammals are modified hairs, with a spongy center covered in a thick, hard layer of keratin and a sharp, sometimes barbed tip.
Spines in mammals include the prickles of hedgehogs and the quills of porcupines as well as the prickly fur of spiny mice and Tenrec. They are also found on Echidna, a monotreme.
The ancient precursor to mammals, Dimetrodon, had extremely long spines on their backbone that were joined together with a web of skin that formed a sail-like structure.
Many mammalian species also have penile spines.
The Mesozoic eutriconodont mammal Spinolestes already displayed spines similar to those of modern spiny mice.[1]
Spines are found in the rays of certain finned bony fishes including scorpion fish. The sting that is found in a stingray is a type of barbed spine.
Spines are also found in invertebrate animals, such as sea urchins. They are a feature of the shell of a number of different species of gastropod and bivalve mollusks, including the venus clam Pitar lupanaria.Spines are also found in internal organs in invertebrates, such as the copulatory spines in the male or female organs of certain flatworms.