* Two Ducks – Identical to " One Duck " except that the ducks appear on screen in pairs.

Two of each of the core histones assemble to form one octameric nucleosome core particle, and 147 base pairs of DNA wrap around this core particle 1. 65 times in a left-handed super-helical turn.

Two words that differ in meaning through a contrast of a single phoneme are called minimal pairs.

* Two pairs:

Two pairs with any ace-high two-card can be played,

Two of the groups learned word pairs, then either slept or stayed awake, and were tested again.

Two pairs of scissor legs attached to the bottom support the mine and allow it to be aimed vertically.

Two to three other pairs are similarly crossed in a null modem.

Two player games are called singles or " one-up " ( one vs. one for the entire game ), while four player games are doubles with two pairs playing against each other ( two vs. two for the entire game ).

Two sisters, three pairs of brothers and a father and son were among those who died, as were two men about to become fathers for the first time ; 25-year-old Steven Brown of Wrexham and 30-year-old Peter Thompson of Widnes.

Two pairs of previously married couples were nominated.

Two stereo pairs of tracks ( four total ) or two monaural analog audio tracks are available on the tape ; one stereo pair or one monophonic track is played or recorded when the tape is moving in one direction and the second pair when moving in the other direction.

* Two single-celled haploid gametes, each containing N unpaired chromosomes, fuse to form a single-celled diploid zygote, which now contains N pairs of chromosomes, i. e. 2N chromosomes in total.

Two pairs of enantiomers: ephedrine ( top ) and pseudoephedrine ( bottom )

Two pairs of tentacles are separate from the other 90-ish, the pre-ocular and post-ocular, situated before and behind the eye.

* Two pairs of opposite sides are equal in length.

* Two pairs of opposite angles are equal in measure.

Two or three parallel lines between pairs of atoms represent double or triple bonds, respectively.

; Number of players: Two or more ; the game is most commonly played with four players in pairs (" Partnership spades ")

Two of the pairs received instructions to visit one of the tribes ' campsites to evaluate which campsite would be more suitable to live at.

Two important algorithms for aligning pairs of sequences are the Needleman-Wunsch algorithm and the Smith-Waterman algorithm.

Two pairs of salivary glands and one or more pairs of pancreatic glands connect to the oesophagus and presumably secrete digestive enzymes.

* Appendages: Two pairs of wings normally present.

“ Two small scalpels, one short grooved director, a tenaculum, two aneurysm needles which may be used as retractors, one pair of artery forceps, haemostatic forceps, two pairs of dissecting forceps, a pair of scissors, a sharp-pointed tenotome, a pair of tracheal forceps, a tracheal dilator, tracheotomy tubes, ligatures, sponges, a flexible catheter, and feathers ”.

Two endangered species of birds are found here: the California least tern and the California clapper rail.

Two million birds, at minimum, pass through at the time, and about half that number use it on southward migration.

It includes part of the Two Rivers National Wildlife Refuge and attracts thousands of birds in migration seasons as part of the Mississippi Flyway.

Two interesting birds often encountered in dense scrub or rainforest include the flightless Brush Turkey ( Alectura lathami ) and the noise mimicking Superb Lyre Bird ( Menura novaehollandiae ).

Most of the birds remaining population is found in Two Peoples Bay Nature Reserve and Waychinicup National Park.

Two species of chough () constitute the genus Pyrrhocorax of the Corvidae ( crow ) family of birds.

* Two stuffed museum birds

* Two species of birds:

* Cebriones, Porphyrion: Two of the giants who featured in the Gigantomachy, they are emblematic of the birds ' revolt against the Olympian order ( lines 553, 1249 – 52 )

Two juvenile birds at Chew Valley Lake, England, in September 1978 and September 1981, were also believed to be hybrids ; they showed mixed characters of the two species, specifically a combination of a dark mantle ( a feature of White-winged Black ) with dark patches on the breast-side ( a feature of Black Tern, not shown by White-winted Black ).

Two juvenile birds at Chew Valley Lake, England, in September 1978 and September 1981, were also believed to be hybrids ; they showed mixed characters of the two species, specifically a combination of a dark mantle ( a feature of White-winged Black ) with dark patches on the breast-side ( a feature of Black Tern, not shown by White-winted Black ).

Two birds roosting together reduce their heat loss by a quarter, and three birds by a third.

Two birds studied in the Parque Nacional de La Macarena of Colombia were free of blood parasites.

* Two birds in Palm tree

Two large birds approached, and chased the boys.

Two specimens of male birds from the northern Western Ghats have been noted to have red-tipped feathers on the malar region almost forming a malar stripe.

Two birds with radio tracking devices travelled back to their site of capture.

Two new birds from Khumba, Eastern Nepal.

Two inches of water in the center is sufficient for most backyard birds, because they do not submerge their bodies, only dipping their wings to splash water on their backs.

Two Gyps vultures, the Indian White-rumped Vulture, Gyps bengalensis, and the " Long-billed Vulture " suffered a 99 percent population decrease in South Asia due to poisoning by diclofenac, a veterinary drug that causes kidney failure in birds that have eaten the carcasses of treated cattle.

Two birds of prey are situated on either side of her head.

Two species of birds have been named in his honor:

Two anonymous sequels were The Peacock ' At Home and The Lion's Masquerade and the Elephant's Champetre, both credited to " A Lady ", and describing similar parties for birds and large mammals.