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Location Taiwan (China), Penghu
Central coordinates 119o 18.00' East  23o 19.00' North
IBA criteria A4i, A4iii
Area 36 ha
Altitude 0 - 79m
Year of IBA assessment 2004

Chinese Wild Bird Federation

Site description Extent of this site: consists of Big and Small Cat Islets. Cat Islets are in the southwestern seas of the Penghu Archipelago; they are 50 km to Makung, 20 km northwest of Chimei Islet; and 25 km west-southwest of Wangan Islet. The peak of Big Cat Islet, in the center of the islet, is 79 m in elevation. It is also the highest peak of the Penghu Archipelago. Small Cat Islet is 100 m to the southeast of Big Cat Islet, with a peak of 50 m. Both islets are named after their cat-like landforms. Surrounded by steep rocky cliffs, the islets are difficult for humans to climb up on. Totally 19 species in 12 families of plants have been recorded here. Chenopodium virgatum is the dominant ground cover on both Big and Small Cat Islets in summer; Silky-haired Crab Grass Digitaria serricea and Formosan Peacock-plume Chloris formosana are the dominant species in winter. The major bird species in Cat Islets are Common Noddy and Bridled Tern, which account for over 95% of all birds.

Key Biodiversity IBA A4iii Criterion Species: include a variety of gulls and terns breeding here in summer. • The average single count of Bridled Terns during 1987 and 1988 was 4,000-6,000 birds. The average count during the 1997 breeding season even rose to 8,000. • The average single count for the Common Noddy during 1987-1998 was 2,000-3,000 birds. The average count in 1997 rose to over 4,500. The accuracy of the estimation is higher than 80%.

Non-bird biodiversity: • Nineteen species of plants in 12 families have been recorded.

Populations of IBA trigger species

Species Season Period Population estimate Quality of estimate IBA Criteria IUCN Category
Bridled Tern Onychoprion anaethetus breeding  1987-1997  4,000-8,000 individuals  good  A4i  Least Concern 
A4iii Species group - waterbirds unknown  1987  20,000 individuals  unknown  A4iii   

Protected areas

Protected area Designation Area (ha) Relationship with IBA Overlap with IBA (ha)  
Cat-Islet Wildlife Refuge 10 protected area contained by site 10  


IUCN habitat Habitat detail Extent (% of site)
Sea   major
Coastline   major

Protection status PA

References • Lin, C. S. et at. 1991. Geology and Landforms of the Penghu Archipelago. Taiwan Provincial Education Board. • Lin, C. H. et al. 1997. Penghu Cat Islet Seabird Refuge. Penghu County Government. • Penghu County Government. 1997. Revision of Penghu Cat Islet Seabird Refuge Plan. Penghu County Government. • Department of Zoology, National Taiwan University. 1999. Wildlife Refuges in Taiwan. Council of Agriculture, Executive Yuan. • Chang, T. G. Report on the Investigation of the Avian Resources of Penghu Cat islet Seabird Refuge. Penghu County Government. • Jeng, C. S. 1999. Avian Resources of the Penghu Archipelago. Penghu County Government.

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Recommended citation  BirdLife International (2016) Important Bird and Biodiversity Area factsheet: Cat Islet Seabird Refuge, Penghu County Refuge. Downloaded from on 26/10/2016

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