Potamon fluviatile crabs' unusual size, up to , and longevity (up to 15 years) are also interpreted as evidence of a long-established population, by analogy with island gigantism. On the island of Malta, "Potamon fluviatile" is rare and restricted to a few locations in the west of the island. On Gozo, there is a single population which inhabits a stretch of river only long. In the Balkan Peninsula, "Potamon fluviatile" is known to occur in Croatia, Montenegro, the Republic of Macedonia, Albania and Greece. There are four species of "Potamon" in the Balkans, and "P. fluviatile" is replaced by "Potamon ibericum" in
Life Is a Highway song's well-known chorus. Eventually that version was released on the 25th-anniversary reissue of the album as "Love is a Highway". While his trip to Africa was influential to a notable portion of the "Mad Mad World" album, it was especially formative to the final version of "Life is a Highway". Cochrane says he was trying to unpack the poverty he witnessed on his trip, which he found "shocking and traumatic". He later said the uptempo spirit of the song came from looking for something positive to "hang the experience on." Most of the vocals on the track were recorded in