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The comet moth or Madagascan moon moth (Argema mittrei) is a moth native to the rain forests of Madagascar. The species was first described by Félix Édouard Guérin-Méneville in 1847. The adult moth cannot feed and only lives for 4 to 5 days. Although endangered in the wild due to habitat loss, the comet moth has been bred in captivity.

There are physical differences among females and males. Females have more rounded wings. The male has a wingspan of 20 cm (7.9 inches) and a tail span of 15 cm (5.9 inches), making it one of the world's largest silk moths. The males have long, feathery antennas and the females have thin antennas. Argema mittrei wings have large eyespot, giving the appearance of a large and dangerous creature that should not be attacked.

The yellow boxfish (Ostracion cubicum) is a species of boxfish found in reefs throughout the Pacific Ocean and Indian Ocean as well as the southeastern Atlantic Ocean. Recorded occasionally since 2011 in the Levantine waters of the Mediterranean Sea which it likely entered via the Suez Canal, it is a species appreciated in the aquarium trade.

O. cubicum reaches a maximum length of 45 centimetres (18 in). As the name suggests, it is box-shaped. Boxfish are also known for their armored and rigid body which in most cases would inhibit locomotion. This disadvantage is offset by the boxfish's carapace shape which is much more advantageous for its adapted style of swimming, known as ostraciiform locomotion. When juvenile, it is bright yellow in color. As it ages, the brightness fades and very old specimens have blue-grey to black coloration with faded yellow.

While they are mainly known to reside in Indian coasts, earlier records show that this species has earlier reports in the Lakshadweep Islands, Andaman & Nicobar Islands as well as the Chennai coast

The yellow boxfish's diet consists mainly of marine algae, but it may also feed on worms, sponges, crustaceans, molluscs, and small fish.

When stressed or injured it releases the neurotoxin tetrodotoxin (TTX) from its skin, which may prove lethal to fish in surrounding waters. The bright yellow color and black spots are a form of warning coloration (aposematism) to any potential predators

Yellow boxfish are solitary animals. Breeding occurs during the spring, in small groups that consist of 1 male and 2–4 females.

In 2006, Mercedes-Benz unveiled its Bionic concept car, which was inspired by the shape of the yellow boxfish. It was assumed that due to the extreme agility with which boxfish maneuver, that their shape was aerodynamic and self-stabilizing. However, analysis by scientists suggests that boxfish agility is instead due to the combination of an aerodynamically unstable body and the manner in which the fish use their fins for movement.

The reedfish, ropefish (more commonly used in the United States), or snakefish, Erpetoichthys calabaricus, is a species of fish in the family Polypteridae alongside the bichirs. It is the only member of the genus Erpetoichthys. It is native to fresh and brackish waters in West and Central Africa. The reedfish possesses a pair of lungs in addition to gills, allowing it to survive in very oxygen-poor water. It is threatened by habitat loss through palm oil plantations, other agriculture, deforestation, and urban development.

The largest confirmed reedfish museum specimen was 37 cm (15 in) long, and three studies where more than 2,000 wild reedfish were caught (using basket traps, meaning that only individuals longer than 15–20 cm [6–8 in] were retained) found none that exceeded 41.4 cm (16.3 in). Although sometimes claimed to reach up to 90 cm (3 ft) long, this is incorrect.

Body elongation in fishes, such as eels, usually happens through the addition of caudal (tail) vertebrae, but in bichirs it has happened through the addition of precaudal vertebrae. Reedfish have evolved a more snakelike body by having twice as many precaudal vertebrae as the members of its sister genus Polypterus, despite having the same number of tail vertebrae. Pelvic fins are absent, and the long dorsal fin consist of a series of well-separated spines, each supporting one or several articulated rays and a membrane. The reedfish possesses a pair of lungs, enabling it to breathe atmospheric air. This allows the species to survive in water with low dissolved oxygen content and to survive for an intermediate amount of time out of water. The sexes are very similar in both median and maximum length, but females average heavier than males of a similar length, and they can be reliably separated by the shape of their anal fin. Reedfish are dark above and on the sides, with lighter orangish or yellowish underparts. Males are generally more olive-green in colour, whereas females generally are more yellowish-brown. Larvae have conspicuous external gills, making them resemble salamander larvae.

The genus name derives from the Greek words erpeton (creeping thing) and ichthys (fish).

The ocean sunfish or common mola (Mola mola) is one of the largest bony fish in the world. It is the type species of the genus Mola, and one of five extant species in the family Molidae. It was once misidentified as the heaviest bony fish, which was actually a different and closely related species of sunfish, Mola alexandrini. Adults typically weigh between 247 and 1,000 kg (545 and 2,205 lb). It is native to tropical and temperate waters around the world. It resembles a fish head without a tail, and its main body is flattened laterally. Sunfish can be as tall as they are long when their dorsal and ventral fins are extended.

Its common English name, sunfish, refers to the animal's habit of sunbathing at the surface of the sea.[citation needed] Its common names in Dutch, Portuguese, French, Spanish, Catalan, Italian, Russian, Greek, Hungarian, Norwegian, and German (maanvis, peixe lua, Poisson lune, pez luna, peix lluna, Pesce luna, рыба-луна, φεγγαρόψαρο, holdhal, månefisk and Mondfisch, respectively) mean "moon fish", in reference to its rounded shape. In German, the fish is also known as Schwimmender Kopf, or "swimming head". In Polish, it is named samogłów, meaning "head alone" or "only head", because it has no true tail. In Swedish and Danish it is known as klumpfisk, in Dutch klompvis, in Finnish möhkökala, all of which mean "lump fish". The Chinese translation of its academic name is 翻車魚; fān chē yú, meaning "toppled wheel fish". Many of the sunfish's various names allude to its flattened shape.

It was originally classified in the pufferfish family as Tetraodon mola, its epithet mola is Latin for "millstone", which the fish resembles because of its gray color, rough texture, and rounded body. It is now placed in its own genus Mola and family name Molidae as the type species with two other species: Mola tecta and M. alexandrini (previously known as Mola ramsayi). Extinct relatives of Mola mola lived in the Oligocene and Miocene epochs. However, the earliest known fossil remains of Mola mola itself were found in archaeological middens dating to the Holocene epoch.

The common name "sunfish" without qualifier is used to describe the marine family Molidae and the freshwater sunfish in the family Centrarchidae, which is unrelated to Molidae. On the other hand, the name "ocean sunfish" and "mola" refer only to the family Molidae.

Plectorhinchus chaetodonoides is found in coral-rich parts of clear lagoons and on seaward reefs. The adults are solitary fish, living in the vicinity of and sheltering beneath ledges or caves during the day. The juveniles are found sheltering in corals. It is a carnivorous species which preys on benthic invertebrates such as crustaceans and molluscs, as well as fishes, which it forages for during the night. The juveniles typically swim in a head down posture wildly undulating their fins as they swim, a behaviour which may mimic toxic or distasteful platyhelminths or nudibranchs and so provide some protection from predation.

Plerogyra sinuosa is a jelly-like species of the phylum Cnidaria. It is commonly called "bubble coral" due to its bubbly appearance. The "bubbles" are grape-sized which increase their surface area according to the amount of light available: they are larger during the day, but smaller during the night, when tentacles reach out to capture food. This species requires low light and a gentle water flow. Common names for Plerogyra sinuosa include "grape coral", bladder coral, and pearl coral. According to the IUCN, Plerogyra sinuosa ranges from the Red Sea and Madagascar in the western Indian Ocean to Okinawa and the Line Islands in the Pacific.

Colonies of Plerogyra sinuosa are in the form of an inverted cone that may be as much as a metre (yard) across. The corallites in small colonies are monocentric and trochoid, but become flabellomeandroiid (arranged in valleys, the neighbouring valleys having separate walls) in larger colonies. The septa have smooth margins and are irregularly arranged. The costae on young colonies sometimes form lobes which develop spines. These spines then elongate and a new polyp develops, this budding method being an unusual occurrence among corals.

In the living coral, Plerogyra sinuosa has vesicles resembling bubbles up to 2.5 cm (1 in) in diameter. These enlarge during the day but retract to a certain extent during the night to expose the polyps and their tentacles.

Plerogyra sinuosa is a zooxanthellate species of coral. It obtains most of its nutritional needs from the symbiotic dinoflagellates that live inside its soft tissues including the walls of the vesicles. These photosynthetic organisms provide the coral with organic carbon and nitrogen, sometimes providing up to 90% of their host's energy needs for metabolism and growth. Its remaining needs are met by the planktonic organisms caught by the polyps.