It depends in what sense you mean. I think that Blackbirds are very 'cool' but as for their temperature they are warm blooded and therefore will be quite warm (presuming you mean a live one).
Common Blackbird or Blackbird (Turdus merula)
Blackbird has: Played Jumper in "Sky Drops" in 2009. Played Blackbird in "Blackbird: Rugged" in 2010. Played Blackbird in "Blackbird: Static" in 2010. Played Blackbird in "Blackbird: Jus Someone" in 2010. Played Blackbird in "Cut Chemist featuring Blackbird: Outro" in 2012. Played Singer in "EVNTLIVE: Live Is Our Way of Life, Make It Yours" in 2013.
Common Blackbird was created in 1758.
Chopi Blackbird was created in 1819.
Blackbird - Femizon - was created in 1982.
Eighth Blackbird was created in 1996.
Oriole Blackbird was created in 1766.
Jamaican Blackbird was created in 1859.
Blackbird House was created in 2005.
Bolivian Blackbird was created in 1939.
Andrew Blackbird died in 1908.
Chief Blackbird died in 1800.