Welcome to Question #4 of our Ask the Experts feature where each week we pose one of your questions to our birding experts and then see their responses.
Please welcome this week’s two birding experts:
Pepe Castiblanco: Co-owner and proprietor of Casa Botania B&B and professional birding and nature guide. https://www.casabotania.com/en-gb
David Rodriguez Arias: Tropical Biologist and natural history guide in Monteverde, Costa Rica. https://www.facebook.com/david.rodriguezarias
Question #4: (from SVBC member Janelle Boyett-Hinds from Winnipeg, Canada) ‘I was visiting San Vito (and other parts of Costa Rica) I noticed some bird species could be found all over the place. In particular, the Rufous-tailed Hummingbird, Scarlet-rumped Tanager and the Clay-colored Thrush. Why are these species so successful?’
Pepe: Just as there are many species that don’t tolerate habitats with human impact, there are also species that won’t survive in primary forests. At some point in the evolutionary race, many saw the potential and wide range of food opportunities in the urban areas and adapted to them. Birds exist longer than humans and topographic and/or climatological changes were back then the trigger that would push a species to split into two or several more species. When humans also took part in that game by building cities, roads and plantations, birds did what they had been doing already for millions of years: they continued adapting. Our Thrushes and dear Grackles are no exception to that. Many others couldn’t find a quick way to adapt and disappeared as fast as new species replaced them filling the empty niches. Humans did that too until the Homo sapiens took over.
David: Surely there are others reasons in addition to what I am going to say, but in my opinion, these species of birds evolved in a such an interesting way that allows them to be adapted to live in different habitats. No doubt diet is one of the main reasons they can live in different places. There is a variety of things they can eat: worms, pollen, nectar, fruits, insects, seeds, spiders… The fitness of these species is definitely way stronger than the fitness of some other species that need a specific habitat, or elevation in order to nest and survive.
The best part of all this is that they all are special, one with amazing flight adaptation, one with a beautiful combination of colours on its feathers, and finally, one with a lovely melody.