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:4/5/2017)... -- Today HYPR Corp. , leading innovator in ... the HYPR platform is officially FIDO® Certified . ... that empowers biometric authentication across Fortune 500 enterprises and ... 15 million users across the financial services industry, however ... suites and physical access represent a growing portion of ...
(Date:3/30/2017)...  On April 6-7, 2017, Sequencing.com will host the ... hackathon at Microsoft,s headquarters in Redmond, Washington ... developing health and wellness apps that provide a unique, ... is the first hackathon for personal genomics and ... in the genomics, tech and health industries are sending ...
(Date:3/28/2017)... The report "Video Surveillance Market ... Storage Devices), Software (Video Analytics, VMS), and Service (VSaaS, ... to 2022", published by MarketsandMarkets, the market was valued ... to reach USD 75.64 Billion by 2022, at a ... year considered for the study is 2016 and the ...
Breaking Biology News(10 mins):
(Date:10/11/2017)... ... October 11, 2017 , ... Disappearing forests and increased emissions are the ... million people each year. Especially those living in larger cities are affected by air ... one of the most pollution-affected countries globally - decided to take action. , “I ...
(Date:10/10/2017)... ... October 10, 2017 , ... ... company advancing targeted antibody-drug conjugate (ADC) therapeutics, today confirmed licensing rights that ... Polymerized Liposomal Nanoparticle), a technology developed in collaboration with Children’s Hospital Los ...
(Date:10/10/2017)... , Oct. 10, 2017 SomaGenics announced ... the NIH to develop RealSeq®-SC (Single Cell), expected to ... profiling small RNAs (including microRNAs) from single cells using ... highlights the need to accelerate development of approaches to ... "New techniques for measuring levels of ...
(Date:10/9/2017)... , ... October 09, 2017 , ... The award-winning American ... broadcast first quarter 2018. American Farmer airs Tuesdays at 8:30aET on RFD-TV. , ... faced with the challenge of how to continue to feed a growing nation. At ...
Breaking Biology Technology:
Cached News: