If your view is not too restricted by buildings, there is a fair chance you will see a black kite, gliding serenely overhead.

The kites are dark brown rather than black, with broad wings to help them soar, and forked tails.

Some 2,000 or more black kites head to Hong Kong each autumn, to avoid the frigid winters that make life tough in their breeding grounds in north China and Russia. Birdwatchers survey them at roosting sites where kites gather as evening approaches, especially on wooded slopes southwest of The Peak.

Other birds you can see close to home include bulbuls, which occur almost wherever there are trees, including city parks and gardens. These are fairly small songbirds – around 20cm long, from bill tip to tail tip.

Two species are especially common in Hong Kong. One of them – the light-vented bulbul – is greenish above, pale below, with a striking black-and-white head pattern. The red-whiskered bulbul is browner overall, and easily recognised, as it sports a tall, black, pointy crest, though you need to look closely to spot the small red patches below its eyes.

Bulbuls are sociable birds, often roaming in small parties. Not so another widespread songbird, the magpie-robin.

Male magpie-robins are mostly black above, with white wing patches and bellies, and whistle and warble their songs from perches around their territories. To our ears, the song sounds sweet, but while it might entice females, magpie-robin song also tells rivals, “This is my place – keep out!”

At times, you might see two males chasing one another in short bursts, perching and flashing tails with white undersides and outer feathers, perhaps briefly tussling till one departs.

Male sparrows also cock their tails when squabbling with rivals. But mostly, sparrows seem more interested in looking for seeds than holding territory. Small, brown, and chirping rather than singing, sparrows are easily overlooked. And after all, sparrows are common worldwide, right?

The answer is not quite so simple: in most parts of the world, you see house sparrows – grey-capped males that have black chins and bibs, and drabber brown females. In Hong Kong – as across much of East Asia – we have tree sparrows, with ruddy crowns and black chins in both sexes.

According to J Denis Summers-Smith, the world's leading expert on sparrows, this difference in distribution stems from an era perhaps 10,000 years ago, when house sparrows began associating with wheat farmers in the Middle East, and spread from there, while tree sparrows took to living alongside rice farmers in China.

If you are lucky while out in city parks and country parks, you might see a far more exotic-looking bird: the red-billed blue magpie. Soft blue above, white below, and with a contrasting black head and red bill, this magpie has a striking pattern, and is even more spectacular, as it’s up to 68cm long, over two-thirds of which is tail.

As if to help us humans find them, blue magpies are also very vocal – screeching, chattering and warbling, as they gather in trees, then flap and glide across open areas one at a time, long tails streaming behind them.

Scarlet minivets are even more brightly coloured. The males have black heads and backs, contrasting with scarlet underparts and wing patches. Females are colourful too, but yellow and black instead. The minivets used to be mainly restricted to forests in the New Territories, though in the past five years they have colonised places across Hong Kong, and you may well find them feeding in trees, or hear flamboyant males breezily whistling from treetops.

Calls and songs can be a great help in finding and identifying birds, and some are far more readily heard than seen. You might already know the sound of one of these – which sings “Ko-el”, then repeats this perhaps five times with rising pitch and urgency, till it is yelling rather than singing.

This is a koel, named after its song, and is a kind of cuckoo. Males are jet black, with ivory-coloured bills, and though twice as big as bulbuls they can seem invisible, lurking in the canopies of banyan trees and singing morning, noon and night.

Two more cuckoo species mainly breed in rural areas, and also have loud, distinctive songs. The large hawk-cuckoo is a denizen of woodland hillsides, and has an easily recognised, strident song, which sounds like: “Brain fever … Brain fever! … BRAIN FEVER!” Indian cuckoos arrive around the second week of April, and sing, while flying as well as perched, “One more bottle! One more bottle!”

Large hawk-cuckoos and Indian cuckoos are among the few summer visitors to Hong Kong.

A host of other migrants only stop over, or fly on by without stopping. These include some of the most stunning birds in Hong Kong, in a family known as flycatchers – forest birds that make acrobatic flights after flies, mosquitoes and other insects.

Male narcissus flycatchers are black above, with glow-in-the-dark orange-yellow underparts. Male blue-and-white flycatchers are shining blue above, white below, with black faces. And male Japanese paradise flycatchers are maroon above, pale greyish below, with black heads and outrageously long tails that might almost be the envy of blue magpies.

Numbers of these flycatchers tend to peak during the first three weeks of April, and fluctuate with the weather. During fine spells with southerly winds, there might be remarkably few migrants to be seen, as most are dashing north in the favourable conditions. But if winds swing towards the north, especially with rain arriving, flycatchers and other birds halt their journeys. This can lead to birdwatching bonanzas, with influxes of common birds and a chance of rarities.

While islands such as Po Toi are known hotspots for spring and autumn birdwatching, you could find these migrants even in city parks, on farmland and in country parks, so you might get lucky with great bird sightings close to home.

There are no guarantees, as sometimes it rains but does not pour migrants. Yet the rewards can be great, making for memorable days. After all, even a quiet outing in the rain can beat staying indoors.