Date: 4/2/18 8:16 am From: CHELEMER, MARC J <mc2496...> Subject: Re: [JERSEYBI] The Plight of the Early Bird?
I would be interested to know how long a typical bird can go without food (and is it a function of size? Meaning, can a Crow go longer than a Golden-crowned Kinglet without caloric intake?).
We know that shorebirds can go for long periods without food (the nine-day non-stop flight of Bar-tailed Godwits from Alaska to New Zealand, e.g.). Does that translate at all to neotropicals? Do they "fatten up" before heading north, evolutionarily programmed for just this instance...arriving only to find that food sources are scarce or only occasional?
Given that this snow is supposed to melt fairly quickly, I wonder if recently-arrived Phoebes could live for a day or two without food. I imagine they could, as long as they've got water to drink.
Marc Chelemer Tenafly
-----Original Message----- From: JerseyBirds [mailto:<JERSEYBI...>] On Behalf Of Dave Oster Sent: Monday, April 02, 2018 11:05 AM To: <JERSEYBI...> Subject: Re: [JERSEYBI] The Plight of the Early Bird?
Today's snow may well cause some mortality, but birds (like other animals) are very good at what they do. Remember they are the product of countless previous generations in which only the smartest, fastest and strongest would typically survive. I therefore think of today's birds as "super-organisms".
When normal food sources are not available, early migrants can often exploit alternate or secondary sources. Phoebes, for example, are known to feed on fruit if insects are not available. However, by poking around trees, brushy vegetation and any exposed leaf litter, insect eggs, pupae, and over-wintering adults can often be located. Temperatures are expected to rise this week and I would wager that many of our early migrants will do OK.
Dave Oster Verona
-----Original Message----- From: Aiden Dartley <adartley123...> To: JERSEYBI <JERSEYBI...> Sent: Mon, Apr 2, 2018 10:17 am Subject: [JERSEYBI] The Plight of the Early Bird?
Does anybody know the survival rates of early songbird migrants (Flycatchers, warblers, etc), after the advent of a snowstorm? Surely, the food sources that they depend on would be destroyed by such a weather event?