Sources : Lobster

Aristotle [ca. 350 BCE] (De animalibus, Book 8, chapter 3.5-6): [Book 8, chapter 3.5] The malacostraca [crustaceans, including lobsters] are of the same nature, for they eat everything; they feed upon stones and mud, seaweeds and dung, as the rock crabs, and are also carnivorous. The spiny lobsters also overcome large fishes, and a kind of retribution awaits them in turn, for the polypus [octopus] prevails over the lobster, for they are not inconvenienced by the shell of the lobster, so that if the lobsters perceive them in the same net with them, they die from fear. The spiny lobsters overcome the congers [eels], for their roughness prevents them from falling off. The congers devour the polypi which cannot adhere to them on account of the smoothness of their surface; all the malacia are carnivorous. [Book 8, chapter 3.6] The spiny lobsters also live on small fish, which they hunt for in their holes, for they are produced in such parts of the sea as are rough and stony, and in those places make their habitations; whatever they capture, they bring to their mouth with their double claw, as the crabs do. When not frightened they naturally walk forwards, hanging their horns down at their sides. When alarmed they retreat backwards, and extend their horns to a great distance. They fight with each other like rams with their horns, raising them and striking each other. They are often seen in numbers as if they were gregarious. - [Cresswell translation, 1887]

Pliny the Elder [1st century CE] (Natural History, Book 9, 2; 9, 50; 9, 88): [Book 9, 2] But the largest number ot animals and those of the largest size are in the Indian sea ... in fact in those regions lobsters grow to 6 feet long... [Book 9, 50] In the bloodless class, the lobster is protected by a fragile rind. Lobsters stay in retirement for five months in each year; and likewise crabs, which go into hiding at the same season; and both species discard their old age at the beginning of spring in the same way as snakes do, by renewing their skins. All other aquatic species swim, but lobsters float about in the manner of reptiles; if no danger threatens they go forward in a straight course with their horns, which are buttoned by their own rounded ends, stretched out at their sides, but at a moment of alarm they advance slanting sideways with their horns held erect. They use their horns in fighting one another. The lobster is the only animal whose flesh is of a yielding texture with no hardness, unless it is boiled alive in hot water. Lobsters live in rocky places, whereas crabs live on soft mud. In winter they haunt sunny shores, but in summer they retire into the dim depths of the sea. All creatures of this class suffer in winter, but get fat in autumn and spring, and more so at full moon, because the moon mellows them with its warm glow by night. [Book 9, 88] The lobster is so terrified of the octopus that it dies if it merely sees one near to it... - [Rackham translation]

Thomas of Cantimpré [circa 1200-1272 CE] (Liber de natura rerum, Marine monsters 6.30; Fish 7.47): [Thomas describes the lobster under the names karabo (marine monster) and locusta maris (fish).] [Marine monsters 6.30] Karabo is a great sea monster called gabari. As Aristotle says, monsters of this kind fight with each other most vigorously like rams battering, and defend themselves against enemies with a multitude of allies. Hence they are often seen walking like herds fighting each other. But there are four causes of war in living things. The first cause is natural pride, which prevails in every living thing. The second reason for which they fight is food; the third intercourse; fourth children. For animals of different kinds fight among themselves for offspring, such as hens with kites and geese with ravens. The karabo eats anything; it lives on dung and mud, and therefore the animal is heavy, and when its belly is split open, much mud is found in it. The karabo has a broad tail, so that when it fights, it turns slightly. [Fish 7.47] The lobster [locusta maris] is a marine fish, as Pliny writes, which is four cubits in length. Fragile crusts are fortified in that class which lacks blood. They are hidden for five months. In the spring time they shed their old age in in the same way as snakes do. Lobsters float in the manner of reptiles. If they are not afraid they swim in a straight course with their horns, which are prepared with their proper roundness, extended to the sides; but when in fear they proceed obliquely to the side. They fight each other with their horns. This one animal, unless it is boiled alive in boiling water, has no callus in its fluid flesh. They live in rocky places. They are weaker in the winter, fatter in autumn and spring, and more so at the full moon. It is so afraid of the octopus that it dies when one is near. - [Badke translation/paraphrase]

Bartholomaeus Anglicus [13th century CE] (Liber de proprietatibus rerum, Book13.26): Fish bee diverse in eating. For some eate each other, and be fedde with each others Fish, and the lesse is the mores meate: and so the greater eat them that be lesse, and so he that eateth the one, is eaten of other at last, as Aristotle sayth libro. 6. and he sayth, That a fish that is called Carabo, overcommeth greate Fishes & eateth them: and another that is called Multipes overcommeth the Carabo, and eateth him: also hée sayth, That fishes be fedde with dung and with durt, and with fenne, as the Carabo: and therfore he is heanie, and much fen is found in him... - [Batman]