As the officer spent considerable time outdoors in areas where WNV transmission was relatively high in 2003 and repeatedly handled infected birds, we cannot eliminate the possibility of a mosquito bite or other percutaneous route of transmission.
Although it seems likely that foraging decisions were based upon changes in the energetic requirements of birds, we cannot rule out the possibility that the heavier birds were somehow better able to process toxins at lower temperatures compared to lighter birds, although the possible mechanisms by which this would occur are not clear.
What a commanding role he has in the song!" On "Love Birds", IndiaGlitz wrote, "The first thing that hits our mind talking about birds in Tamil songs, we cannot miss 'Love birds, love birds, Thakathimitha'".
Either we call birds reptiles or we cannot have such a group as the class Reptilia, because it spawned creatures (in fact two whole classes, Aves and Mammalia) that we don't call reptiles.
Although the two methods have been demonstrated to produce comparable telomere measurements in humans [ 57], mice [ 58] and birds [ 52], we cannot exclude that lower heritability estimates in flycatchers are rooted in the methodological approach to quantify telomere length [ 59].
Although our models could potentially have included existing species interactions (i.e., co-occurrence with other bird species [42]), we cannot predict interactions among previously unknown combinations of species.
Because we did not measure the performance of birds on treatment plots, we cannot rule out the possibility that red-backed shrikes obtain fitness benefits by settling near great grey shrikes.
If future data on this fossil provide more affinities toward Psittaciformes, it would further support the idea that stem group parrots were predatory birds, but at present we cannot really support the idea.
But then to follow it up with "for obvious reasons we cannot fly birds of prey during games" just makes it even better.
Because CA ducklings also present slight hyperthyroidism compared to controls (Table 1), in agreement with data in mammals and birds [ 23, 52, 53], we cannot rule out the possibility that the increased expression of avUCP in the cold also involves changes in thyroid status [ 54, 55].
Although red pigments are probably an honest signal of an individual bird's genetic quality (ref), we cannot know this for sure until we know what the molecular mechanisms might be for how birds actually create red pigments.
