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Compared to similarly sized fish, mammals and birds typically have brain sizes fifteen times larger, though some species of fish such as elephantnose fish have very large brain-to-body ratios. However, fish still display intelligence that cannot be explained through Pavlovian and operant conditioning, such as reversal learning, novel obstacle ...
In laboratory studies, Octopus mercatoris, a small pygmy species of octopus, has been observed to block its lair using plastic Lego bricks. [ 41 ] Smaller individuals of the common blanket octopus ( Tremoctopus violaceus ) hold the tentacles of the Portuguese man o' war (whose venom they are immune to), both as means of protection and as a ...
Subfamily Erinaceinae, various species [66] Silvery mole-rat: 25,000,000 Isotropic fractionator Pallium (cortex) Heliophobius argenteocinereus [46] Wahlberg's epauletted fruit bat: 26,000,000 Isotropic fractionator Pallium (cortex) Epomophorus wahlbergi [41] Cape mole-rat: 26,000,000 Isotropic fractionator Pallium (cortex) Georychus capensis [46]
The U.S. Fish and Wildlife Service and Arizona Game and Fish Department have confirmed the tragic death of Hope, a Mexican gray wolf (F2979) who had been living west of Flagstaff, Arizona, since June.
Sharks have one of the highest for fish alongside manta rays (although the electrogenic elephantfish has a ratio nearly 80 times higher—about 1/32, which is slightly higher than that for humans). [14] Treeshrews have a higher brain to body mass ratio than any other mammal, including humans. [15] Treeshrews hold about 10% of their body mass in ...
Thousands of fish species — about 2,500 of them named — call the Amazon River home, but scientists estimate nearly half of the marine creatures lurking in the massive stretch of water remain ...
The Mormyridae, sometimes called "elephantfish" (more properly freshwater elephantfish), are a superfamily of weakly electric fish in the order Osteoglossiformes native to Africa. [1] It is by far the largest family in the order, with around 200 species. Members of the family can be popular, if challenging, aquarium species.
A keen swimmer, this vibrant fish with striking markings is a peaceful tank mate that tends to coexist harmoniously with other species. Also known as threadfin coralfish, cross-stripe butterfly ...