They breathe air through blowholes. Toothed whales are predators that use their teeth to catch squid, fish, marine mammals, etc. Baleen whales have a sieve-like structure called baleen that catches huge amounts of tiny krill for nourishment. There are 10 species of baleen whales.
Baleen whales are larger than the toothed whales.
The average heart rate of large whales is from about 10 to 30 heart beats per minute. The heart rate of the beluga was measured at 12-20 beats per minute. Whales lower their heart rate when they dive beneath the water - this conserves oxygen and lets them dive longer. A whale anatomy quiz to print out. As stated in our privacy policy , we fully respect your privacy and will not use your e-mail address for any purpose other than the newsletter subscription.