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A slug on a wall in Kanagawa, Japan.. Slug, or land slug, is a common name for any apparently shell-less terrestrial gastropod mollusc.The word slug is also often used as part of the common name of any gastropod mollusc that has no shell, a very reduced shell, or only a small internal shell, particularly sea slugs and semi-slugs (this is in contrast to the common name snail, which applies to ...
A larger size suggests a slug is highly fertile, [11] whereas parasitism could mean it suffers from decreased egg production or even sterility. [12] Trail following is a complex behavioural pattern which usually involves the active participation of both slugs. The follower keeps very close to the leader once they are in proximity. [3]
These slugs prefer to eat on cloudy days or at night when temperatures are above 10 degrees Celsius. Mucus-production necessitates moist habitats, such as among leaf-litter, mosses, or fallen trees. Consequently, the black slug becomes most active after rainfall.
This variability stresses the diverse dietary adaptations among slug species and their ecological roles in fungal consumption. [29] Moreover, by consuming fungi, snails and slugs can also indirectly help in their dispersal by carrying along some of their spores [29] [34] or the fungi themselves. [35]
The slugs remain like this for 90 minutes or longer, during which time a spermatophore is manufactured, filled with sperm, and in part passed over to the partner, hidden by the enveloping atria. Eventually one partner starts to become active, the configuration consequently rotates, the atria contract, and the genitalia separate.
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In Iberia, juvenile Kerry slugs become active during twilight and adults become active at night, especially on rainy or very humid nights. [10] [23] [36] Because Ireland is much further north and has a considerably cooler, wetter and more humid climate, the Kerry slug is sometimes active there in the daytime if the weather is humid and overcast ...
Active year-round, saltwater crocodiles are found across Australia, from northern coastal areas and drainages to islands about 60 miles from the mainland (via the Australian Museum).