In many of Finn's experiments both model and mimic were given to the birds
simultaneously so that they had a choice, and he says that "in several
cases I saw the birds apparently deceived by mimicking butterflies. The
Common Babbler was deceived by _Nepheronia hippia_[72] and Liothrix by
_Hypolimnas misippus_. The latter bird saw through the disguise of the
mimetic _Papilio polites_, which, however, was sufficient to deceive the
Bhimraj and King-crow. I doubt if any bird was impressed by the mimetic
appearance of the female _Elymnias undularis_" (cf. Pl. IV, fig. 5). Finn
concluded from his experiments that on the whole they tended to support the
theory of Bates and Wallace, though he admits that the unpalatable forms
were commonly taken without the stimulus of actual hunger and generally
without signs of dislike. Certainly it is as well to be cautious in drawing
conclusions from experiments with captive birds. The King-crow, for
instance, according to Finn shewed a marked dislike for Danaines in
captivity; yet Manders records this {117} species as feeding upon Danaines
under natural conditions (cf. p. 111).
A few further experiments with the birds of this region were carried out by
Manders[73] in Ceylon. The results are perhaps to be preferred to Finn's,
as the birds were at liberty. Manders found that the Brown Shrike (_Lanius
cristatus_) would take butterflies which were pinned to a paling. In this
way it made off with the mimetic females of _Hypolimnas bolina_ and _H.
misippus_, as well as with _Danais chrysippus_ and _Acraea violae_ which
were successively offered to it. Evidently this species had no repugnance
to unpalatable forms. Manders also found that a young Mynah allowed
complete liberty in a large garden would eat such forms as _Acraea violae_
and _Papilio hector_. As the result of his experience Manders considers
that the unpalatability of butterflies exhibiting warning coloration has
been assumed on insufficient data, and he is further inclined to doubt
whether future investigations will reveal any marked preference in those
birds which are mainly instrumental in the destruction of butterflies.
Public-domain text, read in full here on John Shaqi.
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