The Cambridge natural history, Vol. 08 (of 10)Gadow, Hans
Science
The Cambridge natural history, Vol. 08 (of 10)
Gadow, Hans
Animals
The Common Toad can exist without food for a long time, provided the
locality is cool and damp, but it wastes away almost to skin and bones. In
order to disprove the persistently cropping up fable and sensational
newspaper-accounts of toads having been discovered immured in buildings,
where they were supposed to have lived for many years, Frank Buckland put a
dozen specimens into separate holes bored in a block of porous limestone,
covered them up tightly with a glass plate and buried the block a yard deep
in the soil. A second dozen were treated similarly, but were put into a
block of dense sandstone. After a {175}year and two weeks all the toads
enclosed in the latter block were of course found dead and decomposed, but
most of those in the porous block were still alive, with their eyes open,
and did not succumb to starvation until eighteen months of confinement.
These poor creatures could of course not move about, and were practically
undergoing enforced continuous hibernation. Otherwise they would soon have
wasted away and have died within six months. Those which tumble into deep
and dry wells remain rather small, but generally manage to keep alive for
years on the spiders, woodlice, earwigs and other insects which likewise
tumble in.
Toads hibernate far from the water in dry holes or clefts, retiring in the
middle of October in Central Europe, and they do not reappear before March.
Soon after, and this depends naturally upon the season, they congregate in
ponds or pools, and the males, which far outnumber the females, for whom
they fight, make a peculiar little noise, something like the whining bleat
of a lamb, uttering this sound day and night. The male having, after much
wrestling with competitors, secured a female, which is often several times
bigger than himself, clasps her tightly, by pressing his fists into the
armpits, and the pair swim or crawl about in this position sometimes for a
week before the spawning takes place. The number of eggs laid at one
sitting is enormous, varying from 2000 to 7000. They are very small, only
1.5-2.0 mm. in diameter, and are expelled in two double rows or strings,
one coming out of each oviduct. These strings consist of a soft gelatinous
mass, in which the double rows of entirely black eggs are imbedded, and
they measure in the swollen condition about 6 mm. or ¼ inch in diameter,
and from 10 to 15 feet in length. The strings are wound round and between
water-plants by the parents, which move about during the laying and
fertilising process. According to the coldness or warmth of the season the
larvae are hatched in about a fortnight, and for the next few days they
hang on to the dissolving gelatinous mass of the egg-strings. They then
leave the slime and fasten themselves by means of their suckers to the
under side of grasses and water-plants or sticks, with their tails hanging
downwards, still in a rudimentary condition, but henceforth progressing
rapidly.
Public-domain text, read in full here on John Shaqi.
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