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9

I think it looks a lot like a European Pigeon Tick (Argas reflexus). They infest pigeons and they die when infesting humans, which they only do if they are very hungry (yours looks hungry though). May also transmit diseases. Edit: It could also be an Argas vespertilionis (don't know the english name). They infest bats and are a little rounder in shape ...


8

"Evolving from another species" versus "Most Recent Common Ancestor (MRCA)" One cannot say from two extant species that one evolved from the other. It just doesn't make any sense. It is not only true for cats and chimpanzee but it is true for any pair of extant species. One extant species has never evolved from another extant species. However, one can say ...


6

Cats and monkeys have a common ancestor, both are placental mammals, so at the very least they must have both evolved from the first placental mammal. Cats are members of the Laurasiatheria group and primates are members of Euarchontoglires. These groups of mammals probably split off from each other about 100 millionish years ago. For more information about ...


6

My best guess is a soft-bodied tick, perhaps of the Ornithodoros genus, although the determination of the species is a little more difficult. Though, if it's O. erraticus they're known for causing african swine fever in Spain and Portugal (1). Ornithodoros In response to the comments, here's a link from Texas A&M which notes the ticks pump waste+water ...


6

Two compounds are specifically associated with the smell of decaying cadavers (Hoffman et al., 2009), namely: 1,5-pentanediamine (cadaverine), and 1,4-butanediamine (putrescine) Cadaverine is produced by breakdown of lysin and putrescine by the breakdown of ornithine (Science ME). Both are nitrogen-rich compounds and particularly pungent-smelling. ...


4

My best guess would be Trematoda which is a fluke worm that infects mollusk. I would think this is the larval stage of cercaria which is free swimming and develops in the mollusk and then moves on to infect others. Here are some different images of a cercaria: In this YouTube video you will see what is known as a "Rat King" which is just a ball ...


4

The word density in the medical term bone density is used to quantify only the mineral content of the bone (bone mineral). It's not intended to describe the total mass density of the bone like we are used to from physics. This is all on wikipedia: http://en.wikipedia.org/wiki/Bone_density Thus, when one say that a Grizzly bear have 10 times the bone ...


3

Following your answer to my comment, I deduced the “yellow” color to be more brownish as there is not big bird with really bright yellow color (like the golden oriole). With these parameters I search as well in the ornitho.ch database (all observations given by ornithologist professionals and amateurs) : there was no observation of vulture or eagle in that ...


1

Issue with your question This question is full of terms that don't have a proper definition in Biology. I don't think there is any clear definition in the verbs "feel" and "think". Also, I don't fully understand what the differences between feeling or thinking (whatever that means) when sleeping matter for the question of whether some animals "think" (and ...


1

There's a basic philosophical problem with asking why there aren't such-and-such. We could as easily ask why there are no six-limbed vertebrates, or creatures that use hydrogen to fly like balloons. It's not (necessarily) that they're mechanically or biologically impossible, it's just that evolution started down another pathway first, and (by changing the ...



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