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Re: attack on dinosaur--horrific video



Eike wrote:
In the currect case, it's island
naivity; these birds simply know no terrestrial
predators, and haven't for a long time.

With respect...the critical point the video makes (as it relates to a general dinosaur susceptibility to predation) is that an incubating parent is likely to suffer distasterous predation because of a couple of nesting imperatives: if you leave the nest you lose your eggs/hatchlings--i.e., you lose either way; and it is almost impossible to defend a nest at night. Neither of these points relates to naivety--rather, they relate to the eye physiology of (in this case) mammals vs. birds; and (in the case of large non-avian dinosaurs) an inability to nest in remote or hidden locations (a strategy the albatross had successfully employed until the dreaded mouse colonization).
For me, the now-known diversity of Late K mammals ranging into racoon-size, and the general tendency/rule of organismal exploitation of available resources, leaves the hypothesis of large scale nest predation (as seen by almost all extant large egg layers) with two questions: could non-avian dinosaurs see at night?; and could non-avian dinosaurs escape predation by nesting in locations remote or hidden from small nocturnal predators.