抄録
Siberian blue robin, Larvivora cyane, has been treated as an insectivore, which mainly forages on
insects and spiders. Regarding plant prey items for this species, previously there has been only one report that a juvenile male fed on Gamblea (Evodiopanax) innovans fruits on the ground. Here, foraging behavior of this species on two kinds of plant prey items during the autumn migration was reported based respectively on photographs provided by a collaborative birder and on field observations by the author in the Rokko mountains, Hyogo Prefecture, Japan. In the photographs, a juvenile male fed on a seed of the Japanese mallotus, Mallotus japonicus, on the ground under the tree. In the field observations, a juvenile male fed on a fruit from the giant dogwood, Cornus controversa, under the tree. Furthermore, another juvenile male and an adult female were both observed holding a fruit in their bills. Therefore, when combined with previously reported findings of foraging on G. innovans fruits, five individuals of this species have been observed to forage on three kinds of plant prey items. This is one of the few documented instances of frugivory and seed consumption in this species.
