小蜒螺（如上圖）找到了一種將旅行時間從幾年減至幾個月的好辦法——搭便車。
據(jù)美國《科學(xué)》雜志在線新聞報道，生活在南太平洋小島上的16種Neritina aperulata蝸牛會伏在一種體型更大的Nerita pulligera蝸牛的背上,，完成其一生一次的旅行——從河流與小溪向天敵更少且藻類更多的目的地前進(jìn)。這一行為是在強(qiáng)制遷徙過程中搭便車的首個例證,。研究人員在4月22日的《生物學(xué)快報》網(wǎng)絡(luò)版上報告了這一發(fā)現(xiàn),。（生物谷Bioon.com）
生物谷推薦原始出處：
Biology letters，doi: 10.1098/rsbl.2008.0528,，Angus Davison,，Markus P Eichhorn
Mating behaviour in Lymnaea stagnalis pond snails is a maternally inherited, lateralized trait
Angus Davison*, Hayley T Frend, Camile Moray, Hannah Wheatley, Laura J Searle and Markus P Eichhorn
Lateralization of the brain has traditionally been considered a specialization that is confined to the vertebrates, but recent studies have revealed that a range of invertebrates also have a brain that is structurally asymmetric and/or each side performs a different set of functions. Here, we show that the precopulatory mating behaviour of the pond snail Lymnaea stagnalis is lateralized. We present evidence that the asymmetry of the behaviour corresponds to the sinistral or dextral shell coil, or chirality, of the snail, and is apparently also controlled by a maternal effect locus. As sinistral snails also tend to have mirror image brains, these findings suggest that the lateralized sexual behaviour of L. stagnalis is set up early in development, and is a direct consequence of the asymmetry of the entire body.
