Hibernation, Life in the Slow Lane

Biologists are well aware of the trade offs between reproduction and survival for r versus K selected species. Theory predicts that r-selected species grow quickly, produce more offspring at a time, exhibit minimal parental care, and have relatively short lifespans. In contrast, K-selected organisms produce relatively few Read More...

Passive Electroreception in Dolphins

Sharks and other aquatic vertebrates are known to use passive electroreception to detect other organisms in the vicinity. Passive electroreception is the ability of an animal to detect the weak electric field given off by another animal in the vicinity. However,

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Tropical Bats Take it Slow

Finding enough food to sustain the energy costs of foraging is a problem faced by all mammals. However, it is made more difficult for mammals that feed on unpredictable and limited prey. Such is the case in certain neotropical bats. Molossus molossus (Figure 1), for example, Read More...

Solar powered Ibex

Winter is a difficult time for most mammals. Food is often in short supply and thermoregulatory costs are high. Small mammals may avoid the worst winter has to offer by entering torpor or seeking more favorable microclimates in Read More...

Smart as a Possum

What led to the evolution of relatively larger brains in mammals? For that matter, what led to the evolution of relatively larger brains in placental mammals compared to metatherian mammals (marsupials)? These questions remain largely unanswered despite Read More...

Cooler heads prevail

Free diving seals routinely dive, and remain submerged, for periods longer than their predicted aerobic dive limits. Are the physiologists’ calculations in error, or is something else going on here? Read More...