Both parents will lead the young birds to food and care for them for 14 – 16 days until their first flight.

Both the US and Israeli strains are marked by high mortality rates in infected avian populations ; the presence of dead birds — especially Corvidae — can be an early indicator of the arrival of the virus.

( Both bats and birds have retained the thumb for specialized functions.

Both of these birds nest in the Edwards Plateau, the Warbler exclusively.

Both birds incubate and guard the young.

Both birds and reptiles are kept there, and the facility's success in breeding rock iguanas in captivity was reported in the press.

Both condors are very large broad-winged soaring birds, the Andean Condor being 5 cm shorter ( beak to tail ) on average than the northern species, but larger in wingspan.

Both Old World and New World vultures are scavenging birds, feeding mostly from carcasses of dead animals.

D ' Arrigo noted that the flight of a non-motorised hang-glider is very similar to the flight patterns of migratory birds: Both use updrafts of hot air ( thermal currents ) to gain altitude that then permits soaring flight over distance.

Both birds help to incubate.

Both birds build the nest on a main fork or a limb high in a tree, 12-20m high made of dead twigs and lined with grass or other vegetation and sheep ’ s wool.

Both birds gather nest materials, but the female does most of the construction, usually on a horizontal limb or in a crotch well away from the tree trunk, at any height.

Both parents feed the nestlings for a period of 28 – 30 days, until the young birds fledge.

Both feed the young, often leaving them alone for long times ; this unusual habit for wading birds may be made possible by the thick nest walls.

Both birds build the nest on floating platform, after clearing out an area of approximately across.

Both male and female white-striped birds are more aggressive than tan-striped birds during the breeding season.

Both reserves are important for Tern species and a number of wading birds and waterfowl.

Both the breeding and winter habitat of these birds has been degraded by clearance and pollution.

Both of its engines ingest birds and lose thrust as the aircraft returns to the airport, and the plane catches fire during a belly landing.

Both parents look after the young and may perform distraction displays to lure predators away from the nest or young birds.

Apostlebird s. Both species in this family are highly social and live in groups of as many as 20 birds.

Both parents incubate ; the female leaves before the young birds fledge and sometimes before the eggs hatch.

Both parents look after the young birds, who find their own food and are able to fly within a month of hatching.

Both species are short-billed brown birds with a preference for grassland rather the wetland habitats typical of rails.

Both the lower pH and higher aluminium concentrations in surface water that occur as a result of acid rain can cause damage to fish and other aquatic animals.

Both aldoses and ketoses occur in an equilibrium ( starting with chain lengths of C4 ) cyclic forms.

Both species have much grey in their wings in males, which does not occur in the Common Kestrel or its close living relatives but does in almost all other falcons.

Both reactions are catalysed by the same active site and occur via transesterification, without a covalent protein-DNA intermediate, in contrast to reactions catalysed by Ser and Tyr recombinases ( see site specific recombination ).

Both migrations occur at incisive periods, the Mycenaean at the transition to the Late Bronze Age and the Doric at the Bronze Age collapse.

Both these species occur in a normal, a black and a rare white morph, confirming the view that simply dividing into species based on morph ( as had been done earlier ) is incorrect.

Both cannot occur at the same time since the instructions and data use the same bus system.

" Both occur together in Exodus 29: 27.

Both plastic and elastic deformation may occur although one type predominates for a given material.

* Both twins born vaginally-this can occur both presented head first or where one comes head first and the other is breech and / or helped by a forceps / ventouse delivery

Both males and females would be totally economically independent in these living arrangements allowing for marriage to occur without either the male or female ’ s economic status having to change.

Both detonations should occur near the geomagnetic equator.

Both types of abnormalities can occur in gametes and therefore will be present in all cells of an affected person's body, or they can occur during mitosis and give rise to a genetic mosaic individual who has some normal and some abnormal cells.

Both asexual and sexual reproduction occur.

Both asexual and isogamous sexual reproduction occur.

Both courtship and copulation occur on their hosts as well.

Both male and female flowers can occur on the same tree, but it is more common to find all male and all female trees ; a tree that is all male one year can produce female flowers the next, and similarly a female tree can become male.

Both evergreen and deciduous species occur.

Both living and dying should occur within a caring community, and in the context of death, Christian discipleship takes the form of caring for those who are dying ./ This is an era when many people find legislating morality a questionable practice.

Both Meyer, and later Pierre America, who was the first to use the term behavioral subtyping, gave proof-theoretic definitions of some behavioral subtyping notions, but their definitions did not take into account aliasing that may occur in programming language that supports references or pointers.

Both may occur together in the same example, depending on the relevant point of view.

Both outcomes cannot occur for a single trial ( i. e., when a coin is flipped only once ).

Both wings must be stalled for a spin to occur.