Origin of Species Variorum

→ I may add that, according to Dr. Gray and to some other observers, the European cuckoo has not utterly lost all maternal love and care for her own offspring. 1859 1860 1861

I may add that, according to Dr. Gray and some other observers, the European cuckoo has not utterly lost all maternal love and care for her own offspring. 1866

It has, also, recently been ascertained that the cuckoo occasionally lays her eggs on the bare ground, sits on them and feeds her young; this rare and strange event evidently is a case of reversion to the long-lost aboriginal instinct of nidification. 1869

↑ 2 blocks not present in 1859 1860 1861 1866 1869; present in 1872

It has, also, recently been ascertained on sufficient evidence, by Adolf Müller, that the cuckoo occasionally lays her eggs on the bare ground, sits on them, and feeds her young. This rare event is probably a case of reversion to the long-lost, aboriginal instinct of nidification.

↑ 1 blocks not present in 1859 1860 1861; present in 1872 1866 1869

It has been objected by some authors that I have not noticed other related instincts and points of structure in the cuckoo, which are falsely spoken of as necessarily co-ordinated.

→ The occasional habit of birds laying 1859 1860 1861 1866 1869

Various birds, as has already been remarked, occasionally lay 1872

→ other birds nests, either of the same or of a distinct species, 1860

other birds' nests, either of the same or of a distinct species, 1859 1861

other birds' nests, either of the same or of distinct species, 1866

other birds nests, either of the same or of distinct species, 1869

the nests of other birds. This habit 1872

→ this perhaps explains the origin of a 1859 1860 1861 1866 1869

throws some light on the 1872

→ allied group of 1859 1860 1861 1866

nearest allied group, that of 1869

OMIT 1872

→ For several hen ostriches, at least in the case of the American species, 1859 1860 1861

For several hen ostriches 1866 1869

In this family several hen-birds 1872

→ case of the 1859 1860 1861 1866 1869

OMIT 1872

→ has 1859 1860 1861 1866 1869

as in the case of the Molothrus bonariensis, has 1872

→ kinds. 1859 1860 1861 1866

kinds of bees. 1869 1872

→ be necessary 1859 1860 1861 1866

have been indispensable 1869 1872

→ likewise, of Sphegidæ (wasp-like insects) are 1859 1860 1861 1866 1869

of Sphegidæ (wasp-like insects) are likewise 1872

→ on other species; 1859 1860 1861 1866

in the same manner on other species; 1869

OMIT 1872

→ to feed on, 1859 1860 1861 1866

OMIT 1869 1872

→ the supposed case 1859 1860 1861 1866 1869

that 1872

→ cuckoo, 1859 1860 1861 1866 1869

Molothrus or cuckoo, 1872

generated. →I may add that, according to Dr. Gray and to some other observers, the European cuckoo has not utterly lost all maternal love and care for her own offspring. ↑ ↑

→The occasional habit of birds laying their eggs in →other birds nests, either of the same or of a distinct species, is not very uncommon with the

Gallinaceæ;

Gallinaceæ,

Gallinaceæ

and →this perhaps explains the origin of a singular instinct

the →allied group of

ostrich.

ostriches.

→For several hen ostriches, at least in the case of the American species, unite and lay first a few eggs in one nest and then in another; and these are hatched by the males. This instinct may probably be accounted for by the fact of the

here

hens

laying a large number of

eggs,

eggs;

but, as

with

the →case of the cuckoo, at intervals of two or three days.

The

This

instinct, however, of the American

ostrich,

ostrich

→has not as yet been perfected; for a surprising number of eggs lie strewed over the plains, so that in one

day's

days

hunting I picked up no less than twenty lost and wasted eggs.

Many bees are parasitic, and

regularly

always

lay their eggs in the nests of

~~bees of~~

bees of

other →kinds. This case is more remarkable than that of the cuckoo; for these bees have not only

had their

their

instincts but their structure modified in accordance with their parasitic habits; for they do not possess the pollen-collecting apparatus which would →be necessary if they had

stored

store

up food

food

for their own young. Some

species

species,

→likewise, of Sphegidæ (wasp-like insects) are

parasitic;

parasitic

→on other species; and M. Fabre has lately shown good reason for believing

that,

that

although the Tachytes nigra generally makes its own burrow and stores it with paralysed prey for its own

larvæ,

larvæ

→to feed on, yet

that,

that

when this insect finds a burrow already made and stored by another sphex, it takes advantage of the prize, and becomes for the occasion parasitic. In this case, as with →the supposed case of the →cuckoo, I can