Some blue whales in the North Atlantic and North Pacific raise their tail fluke when diving.

Some are deeper, e. g. 6m for the diving pit at Sheffield, England.

Some diving instructors continue to teach single demand valve buddy-breathing as an obsolete but still useful technique ; then they show the method that has superseded it, since availability of two second stages per diver is now assumed in recreational scuba.

Some tourist resorts now offer a surface-supplied diving arrangement, trademarked as Snuba, as an introduction to diving for the inexperienced.

Some diver training organizations and groups of divers teach techniques, such as DIR diving for configuring diving equipment.

Some of these include swimming, waterskiing, boating, surfing and diving.

Some examples include: space suits, air conditioned clothing, armor, diving suits, swimsuits, bee-keeper gear, motorcycle leathers, high-visibility clothing, and other pieces of protective clothing.

The most impressive diving exhibited by shearwaters is found in the Short-tailed Shearwater, which has been recorded diving below 70 m. Some albatross species are also capable of some limited diving, with Light-mantled Sooty Albatrosses holding the record at 12 m. Of all the wing-propelled pursuit divers, the most efficient in the air are the albatrosses, and it is no coincidence that they are the poorest divers.

Some dive locations even provide the opportunity to combine diving and bird watching, in particular the Pinnacles, where Guillemots can be found fishing at safety stop depth.

* Subfamily: Aythyinae, diving ducks ( Some 15 species of diving ducks, of worldwide distribution, in 2 – 4 genera ; The 1986 morphological analysis suggested that the probably extinct Pink-headed Duck of India, previously treated separately in Rhodonessa, should be placed in Netta, but this has been questioned.

Some studies published on the phylogeny of the petrels suggests that the diving petrels are actually members of the family Procellariidae, and some taxonomic works treat them as such.

Some prefer to use a full face diving mask to essentially eliminate any contact with the cold water.

Some say that technical diving is any type of scuba diving that is considered higher risk than conventional recreational diving.

Some precautions and skills for night diving include: avoiding shining your light in other divers ' eyes, to be aware of and use surface light signals for bearings, or similarly use a surface marker buoy with an attached strobe or cyalume stick.

Some commercial dry suits are rated for hazardous-environment diving, and when combined with a full-face helmet can completely isolate and protect the diver from hazardous environments such as sewage pits and chemical storage tanks.

Some British armed forces divers used bulky thick diving suits called Sladen suits ; one version of it had a flip-up single faceplate for both eyes to let the user get binoculars to his eyes when on the surface.

Some sport diving clubs include the word " Frogmen " in their names.

Some frogmen use an ordinary diving mask ; some use a fullface mask, which is less easily lost underwater.

Some species are carnivorous at the tadpole stage, eating insects, smaller tadpoles and fish.

Some of the plants are herbs that produce enough scent to possibly dilute the odours of nearby plants, or the pheromones emitted by insects that find those plants, which would otherwise attract more pests.

Some Jains abstain from farming because it inevitably entails unintentional killing or injuring of many small animals, such as worms and insects, but agriculture is not forbidden in general and there are Jain farmers.

After attending one such lecture, UFO investigator Robert Sheaffer wrote " Some of his “ rods ” were obviously insects zipping across the field at a high angular rate.

Some arthropods however, especially large insects with tracheal respiration, expand their new exoskeleton by swallowing or otherwise taking in air.

Some plants have pest repelling properties or draw beneficial insects to the garden.

Some have argued that insects diversified with angiosperms because insect anatomy, especially the mouth parts, seems particularly well-suited for flowering plants.

Some insects, amphibians, molluscs, crustaceans, Cnidarians, echinoderms and tunicates undergo metamorphosis, which is usually accompanied by a change of habitat or behavior.

Some kinds of exoskeletons undergo periodic moulting as the animal grows, as is the case in many arthropods including insects and crustaceans.

Some observations of living insects have been possible, however.

Some insects, such as ant eggs and silk worms, are also eaten boiled in a soup in Isan, or used in omelets in northern Thailand.

Some yeasts are found in association with soil and insects.

Some specialise in the liquid in pitchers of particular species of pitcher plants, their larvae feeding on decaying insects that had drowned there or on the associated bacteria ; the harmless genus Wyeomyia provides such examples — Wyeomyia smithii breeds only in the pitchers of Sarracenia purpurea.

Some groups of plants developed nectar and large sticky pollen, while insects evolved more specialized morphologies to access and collect these rich food sources.

Some of the common insects found at elevations above 2, 000 feet are orange paper wasps, honey bees, black flies, tarantula hawks, stink bugs, beetles, black ants, and monarch and swallowtail butterflies.

Some butterflies have evolved symbiotic and parasitic relationships with social insects such as ants.

Some species are pests because in their larval stages they can damage domestic crops or trees ; however, some species are agents of pollination of some plants, and caterpillars of a few butterflies ( e. g., Harvesters ) eat harmful insects.

Some seeds are shed when the cone scales shrink during hot weather in late summer, but most are liberated when the cone dries from fire heat or is damaged by insects.

Some types of insects, and molluscs such as the octopus, also have strong spatial learning and navigation abilities, but these appear to work differently from the mammalian spatial system, so there is as yet no good reason to think that they have a common evolutionary origin ; nor is there sufficient similarity in brain structure to enable anything resembling a " hippocampus " to be identified in these species.

Some species, particularly the ground-doves and quail-doves take a large number of prey items such as insects and worms.

Some authors draw a distinction in writing the common names of insects.

Some small insects do demonstrate continuous respiration and may lack muscular control of the spiracles.

Some plants may be grown for food production, some to attract beneficial insects, and others to repel harmful insects.

Some insects in the adult form are nectar or pollen feeders, while in the larval form they are voracious predators of pest insects.