There are, however, two of our native birds, or rather summer visitors, since they leave us in autumn, closely associated with these warm June nights, the stillness of which they break in very different fashion, and these are the nightingale and nightjar. Each is of considerable[68] interest in its own way. It is not to be denied that the churring note of the nightjar is, to ordinary ears, the reverse of attractive, and the bird is not much more pleasing to the eye than to the ear; while the nightingale, on the contrary, produces such sweet sounds as made Izaak Walton marvel11 what music God could provide for His saints in heaven when He gave such as this to sinners on earth. The suggestion was not wholly his own, since the father of angling borrowed it from a French writer; but he vastly improved on the original, and the passage will long live in the hearts of thousands who care not a jot12 for his instructions in respect of worms. At the same time, the nightjar, though the less attractive bird of the two, is fully13 as interesting as its comrade of the summer darkness, and there should be no difficulty in indicating the little that they have in common, as well as much wherein they differ, in both habits and appearance.
Both, then, are birds of sober attire14. Indeed of the two, the nightjar, with its soft and delicately pencilled plumage and the conspicuous15 white spots, is perhaps the handsomer,[69] though, as it is seen only in the gloaming, its quiet beauty is but little appreciated. The unobtrusive dress of the nightingale, on the other hand, is familiar in districts in which the bird abounds16, and is commonly quoted, by contrast with its unrivalled voice, as the converse17 of the gaudy18 colouring of raucous19 macaws and parrakeets. As has been said, both these birds are summer migrants, the nightingale arriving on our shores about the middle of April, the nightjar perhaps a fortnight later. Thenceforth, however, their programmes are wholly divergent, for, whereas the nightjars proceed to scatter20 over the length and breadth of Britain, penetrating21 even to Ireland in the west and as far north as the Hebrides, the nightingale stops far short of these extremes and leaves whole counties of England, as well as probably the whole of Scotland, and certainly the whole of Ireland, out of its calculations. It is however well known that its range is slowly but surely extending towards the west.
This curiously22 restricted distribution of the nightingale, indeed, within the limits of its summer home is among the most remarkable[70] of the many problems confronting the student of distribution, and successive ingenious but unconvincing attempts to explain its seeming eccentricity23, or at any rate caprice, in the choice of its nesting range only make the confusion worse. Briefly24, in spite of a number of doubtful and even suspicious reports of the bird's occurrence outside of these boundaries, it is generally agreed by the soundest observers that its travels do not extend much north of the city of York, or much west of a line drawn25 through Exeter and Birmingham. By way of complicating26 the argument, we know, on good authority, that the nightingale's range is equally peculiar27 elsewhere; and that, whereas it likewise shuns28 the departments in the extreme west of France, it occurs all over the Peninsula, a region extending considerably29 farther into the sunset than either Brittany or Cornwall, in both of which it is unknown. No satisfactory explanation of the little visitor's objection to Wild Wales or Cornwall has been found, and it may at once be stated that its capricious distribution cannot be accounted for by any known facts of soil,[71] climate, or vegetation, since the surroundings which it finds suitable in Kent and Sussex are equally to be found down in the West Country, but fail to attract their share of nightingales.
The song of the nightingale, in praise of which volumes have been written, is perhaps more beautiful than that of any other bird, though I have heard wonderful efforts from the mocking-bird in the United States and from the bulbuls along the banks of the Jordan. The latter are sometimes, more especially in poetry, regarded as identical with the nightingale; and, indeed, some ornithologists hold the two to be closely related. What a gap there is between the sobbing30 cadences31 of the nightingale and the rasping note of the nightjar, which, with specific reference to a Colonial cousin of that bird Tasmanians ingeniously render as "more pork"! It seems almost ludicrous to include under the head of birdsong not only the music of the nightingale, but also the croak of the raven32 and the booming note of the ostrich33. Yet these also are the love-songs of their kind, and the hen ostrich doubtless[72] finds more music in the thunderous note of her lord than in the faint melody of such song-birds as her native Africa provides. The nightingale sings to his mate while she is sitting on her olive-green eggs perching on a low branch of the tree, at foot of which the slender nest is hidden in the undergrowth. So much is known to every schoolboy who is too often guided by the sound on his errand of plunder34; and why the song of this particular warbler should have been described by so many writers as one of sadness, seeing that it is associated with the most joyous35 days in the bird's year, passes comprehension. So obviously is its object to hearten the female in her long and patient vigil that as soon as the young are hatched the male's voice breaks like that of other choristers to a guttural croak. It is said, indeed—though so cruel an experiment would not appeal to many—that if the nest be destroyed just as the young are hatched the bird recovers all his sweetness of voice and sings anew while another home is built.
Although poetic36 licence has ascribed the song to the female, it is the male nightingale[73] only that sings, and for the purpose aforementioned. The note of the nightjar, on the other hand, is equally uttered by both sexes, and both also have the curious habit of repeatedly clapping the wings for several minutes together. They moreover share the business of incubation, taking day and night duty on the eggs, which, two in number, are laid on the bare ground without any pretence37 of a nest, and generally on open commons in the neighbourhood of patches of fern-brake. Like the owls, these birds sleep during the day and are active only when the sun goes down. It is this habit of seeking their insect food only in the gloaming which makes nightjars among the most difficult of birds to study from life, and all accounts of their feeding habits must therefore be received with caution, particularly that which compares the bristles38 on the mouth with baleen39 in whales, serving as a sort of strainer for the capture of minute flying prey40. This is an interesting suggestion, and may even be sober fact; but its adoption41 would necessitate42 the bird flying open-mouthed among the oaks and other trees beneath which it finds[74] the yellow underwings and cockchafers on which it feeds, and I have more than once watched it hunting its victims with the beak43 closed. I noticed this particularly when camping in the backwoods of Eastern Canada where the bird goes by the name of nighthawk.
In all probability its food consists exclusively of insects, though exceptional cases have been noted44 in which the young birds had evidently been fed on seeds. The popular error which charges it with stealing the milk of ewes and goats, from which it derives45 the undeserved name of "goat-sucker," with its equivalent in several Continental46 languages, is another result of the imperfect light in which it is commonly observed. Needless to say, there is no truth whatever in the accusation47, for the nightjar would find no more pleasure in drinking milk than we should in eating moths48.
Here, then, are two night-voices of very different calibre. These are not our only birds that break the silence on moonlight nights in June. The common thrush often sings far into the night, and the sedge-warbler is a[75] persistent49 caroller that has often been mistaken for the nightingale. The difference in this respect between the two subjects of these remarks is that the nightjar is invariably silent all through the day, whereas the nightingale sings joyously50 at all hours. It is only because his splendid music is more marked in the comparative silence of the night, with little or no competition, that his daylight concert is often overlooked.
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1
bent
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n.爱好,癖好;adj.弯的;决心的,一心的 | |
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2
croak
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vi.嘎嘎叫,发牢骚 | |
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3
marshes
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n.沼泽,湿地( marsh的名词复数 ) | |
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4
shrill
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adj.尖声的;刺耳的;v尖叫 | |
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5
owls
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n.猫头鹰( owl的名词复数 ) | |
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6
hoot
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n.鸟叫声,汽车的喇叭声; v.使汽车鸣喇叭 | |
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7
melodious
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adj.旋律美妙的,调子优美的,音乐性的 | |
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badger
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v.一再烦扰,一再要求,纠缠 | |
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9
otter
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n.水獭 | |
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10
browsing
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v.吃草( browse的现在分词 );随意翻阅;(在商店里)随便看看;(在计算机上)浏览信息 | |
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11
marvel
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vi.(at)惊叹vt.感到惊异;n.令人惊异的事 | |
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12
jot
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n.少量;vi.草草记下;vt.匆匆写下 | |
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13
fully
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adv.完全地,全部地,彻底地;充分地 | |
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attire
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v.穿衣,装扮[同]array;n.衣着;盛装 | |
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15
conspicuous
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adj.明眼的,惹人注目的;炫耀的,摆阔气的 | |
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16
abounds
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v.大量存在,充满,富于( abound的第三人称单数 ) | |
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17
converse
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vi.谈话,谈天,闲聊;adv.相反的,相反 | |
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18
gaudy
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adj.华而不实的;俗丽的 | |
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raucous
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adj.(声音)沙哑的,粗糙的 | |
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20
scatter
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vt.撒,驱散,散开;散布/播;vi.分散,消散 | |
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21
penetrating
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adj.(声音)响亮的,尖锐的adj.(气味)刺激的adj.(思想)敏锐的,有洞察力的 | |
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22
curiously
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adv.有求知欲地;好问地;奇特地 | |
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23
eccentricity
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n.古怪,反常,怪癖 | |
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24
briefly
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adv.简单地,简短地 | |
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25
drawn
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v.拖,拉,拔出;adj.憔悴的,紧张的 | |
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26
complicating
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使复杂化( complicate的现在分词 ) | |
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27
peculiar
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adj.古怪的,异常的;特殊的,特有的 | |
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28
shuns
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v.避开,回避,避免( shun的第三人称单数 ) | |
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29
considerably
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adv.极大地;相当大地;在很大程度上 | |
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30
sobbing
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<主方>Ⅰ adj.湿透的 | |
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31
cadences
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n.(声音的)抑扬顿挫( cadence的名词复数 );节奏;韵律;调子 | |
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32
raven
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n.渡鸟,乌鸦;adj.乌亮的 | |
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33
ostrich
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n.鸵鸟 | |
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34
plunder
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vt.劫掠财物,掠夺;n.劫掠物,赃物;劫掠 | |
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35
joyous
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adj.充满快乐的;令人高兴的 | |
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36
poetic
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adj.富有诗意的,有诗人气质的,善于抒情的 | |
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37
pretence
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n.假装,作假;借口,口实;虚伪;虚饰 | |
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38
bristles
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短而硬的毛发,刷子毛( bristle的名词复数 ) | |
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39
baleen
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n.鲸须 | |
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40
prey
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n.被掠食者,牺牲者,掠食;v.捕食,掠夺,折磨 | |
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41
adoption
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n.采用,采纳,通过;收养 | |
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42
necessitate
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v.使成为必要,需要 | |
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43
beak
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n.鸟嘴,茶壶嘴,钩形鼻 | |
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44
noted
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adj.著名的,知名的 | |
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45
derives
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v.得到( derive的第三人称单数 );(从…中)得到获得;源于;(从…中)提取 | |
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46
continental
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adj.大陆的,大陆性的,欧洲大陆的 | |
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47
accusation
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n.控告,指责,谴责 | |
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48
moths
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n.蛾( moth的名词复数 ) | |
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49
persistent
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adj.坚持不懈的,执意的;持续的 | |
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50
joyously
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ad.快乐地, 高兴地 | |
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