Bird Migration 2 - syn

feats of endurance

extraordinary feats / remarkable achievements

intricately

elaborately / with great complexity

lift and thrust

lifting force / propulsive force

navigation systems

guidance systems / orientation systems

superior to

better than / surpassing

ingenious

clever / inventive

blood circulation

blood flow / circulatory flow

waterproof plumage

water-resistant feathers / waterproof feathers

respiratory systems

breathing systems / pulmonary systems

altitude

height / elevation

extract

draw out / obtain

breeding season

mating season / reproductive season

accumulate

build up / gather

long migratory flights

extended migration journeys / long-distance migrations

in short supply

scarce / limited

temperate

mild / moderate

abundant

plentiful / ample

growing season

period of growth / cultivation season

tolerate

withstand / endure

puzzling

confusing / perplexing

presumably

probably / supposedly

necessitate

require / make necessary

en route

on the way / in transit

overfly

fly over / pass over

seemingly suitable habitat

apparently suitable habitat / seemingly appropriate habitat

marvel at

be amazed at / admire

parental guidance

parental instruction / parental supervision

juveniles in tow

young birds following / juveniles accompanying

youngsters

juveniles / young birds

no inkling

no idea / no awareness

mind-boggling

astonishing / baffling

host species

foster species / surrogate species

makes its own way

navigates independently / finds its own route

single-handedly

alone / independently

seek out a mate

look for a partner / find a mate

obvious implication

clear consequence / evident implication

inherit

acquire genetically / receive

inbuilt route map

innate route map / built-in navigation map

direction-finding capability

navigational ability / orientation ability

mounting evidence

growing evidence / increasing evidence

compass directions

compass bearings / directional guidance

magnetic field

geomagnetic field / Earth's magnetic field

minute crystals of magnetite

tiny magnetite crystals / microscopic magnetite particles

landmass

mainland / large land area

phenomenal powers

extraordinary abilities / remarkable powers

compute

calculate / work out

sophisticated cues

complex signals / advanced cues

pull of the earth

Earth's gravitational pull / Earth's attraction

sensory perception

sensory awareness / perception

setting sun

sunset / descending sun

plane of polarized light

polarized light pattern / polarized light plane

calibrate

adjust / fine-tune

dehydration

loss of body fluids / water loss

turbulent

unstable / disturbed

conducive

facilitating / favorable to

arrive safely

reach safely / arrive unharmed

set off

depart / embark

accurate weather forecasting

precise weather prediction / reliable weather forecasting

be adept at

be skilled at / be proficient in

barometric pressure

atmospheric pressure / air pressure

ceiling

upper surface / roof

at the onset of a cold snap

at the beginning of a cold spell / when cold weather starts

presaging

foreshadowing / signaling

shearwater

sea bird / pelagic bird

burrow

den / underground hole

blown across

carried by the wind / swept across

westerly tailwinds

west winds / favorable westerly winds

ringing evidence

clear evidence / convincing evidence

climes

climates / regions