HOME >> BIOLOGY >> NEWS
Coots can count

they're done. Speculation about the nature of the cue has long favored the sense of touch--when the female feels like she's sitting on the right number of eggs, the development of new egg follicles stops.

(Follicles that have already started developing continue to develop, so there is a delay between the cue and the cessation of egg laying.)

If the birds use a touch cue, the presence of parasitic eggs should cause a female to lay fewer of her own eggs. But Lyon found that when female coots recognized the parasitic eggs in their nests, eventually rejecting them, they did not reduce their clutch size. In contrast, females that failed to recognize parasitic eggs laid one fewer of their own eggs for each parasitic egg they received.

"Rejection takes a long time, so the clutch-size decision is made while the parasitic eggs are still in the nest," Lyon said. "That means they are not using a touch cue. These birds are looking at their nests and counting only those eggs they recognize as their own to make a clutch-size decision."

Lyon noted that the meaning of "counting" in animals is a highly contentious issue among cognitive psychologists and animal behavior experts. What he means by counting is that the birds are making decisions based on the number of eggs in their nests.

"That's pretty amazing for a 'stupid' bird like a coot," Lyon said. "It's very satisfying to rescue a study animal from a bad rap."


'"/>

Contact: Tim Stephens
stephens@ucsc.edu
831-459-4352
University of California - Santa Cruz
2-Apr-2003


Page: 1 2 3

Related biology news :

1. Restoring sweetgrass to the South Carolina lowcountry
2. New lower-cost assay system equivalent to flow cytometry for accurate CD4+/CD8+ cell counts
3. Study: Artificial sweetener may disrupt bodys ability to count calories
4. Clinical judgement still counts strongly alongside genetic testing
5. Fire ant killing protozoa found in 120 Texas counties
6. American Lung Associations 2004 State of the Air report ranks cities and counties with dirty air
7. HHMI international programs build science capacity in developing countries
8. Transgenic mosquitoes are less fertile than their counterparts in nature
9. Lifestyle accounts for difference in chimp, human genome
10. Aspirin use safe and effective in patients with abnormal red cell counts (or with polycythemia)
11. Marine pathogens spread much faster than their terrestrial counterparts

Post Your Comments:
*Name:
*Comment:
*Email:


(Date:12/5/2018)... ... 03, 2018 , ... uBiome, the leader in microbial genomics, ... Division of Gastroenterology and Hepatology at UC San Diego and staff gastroenterologist at ... board of leading scientists and doctors from around the world, Dr. Zarrinpar will ...
(Date:12/5/2018)... ... December 04, 2018 , ... Lifecycle Biotechnologies, a ... their 100-liter (26 gallon) SAFEthread Drum. The 100-liter SAFEthread Drum follows the ... a much-needed modern redesign to the plastic drums being used globally. Manufactured ...
(Date:11/29/2018)... (PRWEB) , ... November 29, 2018 , ... ... in Semba Biosciences with the intention of acquiring full ownership. The transaction was ... Agreement was executed on November 14, 2018. “We are extremely pleased to team ...
Breaking Biology News(10 mins):
(Date:11/13/2018)... ... November 13, 2018 , ... Aditya Humad, Managing Partner ... week that asserts it is still trending upward with growing valuations based on ... describes market consolidation, pricing pressure and increased competition as reasons often cited by ...
(Date:11/9/2018)... ... 08, 2018 , ... IC System, one of the largest ... increasing recovery rates by creating a comprehensive contact strategy for each consumer. ... NLP Logix, a Jacksonville, Florida-based AI solutions company, and leveraged the decades of ...
(Date:11/5/2018)... ... November 05, 2018 , ... ... education center to increase access to science research and education in the Frederick ... Technology (CREST) aims to provide access to STEM-based undergraduate and graduate degree and ...
(Date:11/3/2018)... ... 01, 2018 , ... Triangle Insights Group, a premier life sciences consulting firm, ... private companies in the United States, appearing on this year’s Inc. 5000 list. ... percentage revenue growth over the previous three years. , Separately, Triangle Insights was ...
Breaking Biology Technology:
Cached News: